There should be no problem... Electrum manages all addresses that are derived from your xprv/xpub (or the addresses that are from a imported private key(s)), the used ones, the change addresses and the unused ones. Re-using an address will only be bad for your anonimity... but that's the only problem that might arise.

If electrum doesn't pick up the transaction, it might be a good idear to restart electrum and/or make sure you have a recent version. [just re-read you OP, and it seems your version should be ok]

BTW, watch-only wallet You do have either the xprv or the private key, right?

If this doesn't work, it would be nice to show us the transaction id.

Even een stapje terugnemen... Ik denk dat je wat verward bent ivm een aantal basisconcepten van bitcoin (en andere gelijkaardige crypto currencies).
Ik ga je een sterk vereenvoudigd verhaal vertellen over bitcoin (ik ga zelfs grote stukken weglaten), maar de verhalen voor bijvoorbeeld litecoin of NLG zijn vrijwel volledig identiek.

Bitcoin maakt gebruik van een gedecentraliseerde databank. Iedereen die een volledige wallet (portemonnee) of een node draaid, download en checked eerst de volledige databank.
Een bitcoin bestaat eigenlijk niet, je kan geen bitcoin vasthouden. Als je aan iemand verteld dat je bitcoins bezit, zeg je eigenlijk dat in de grote, decentrale databank een paar "lijnen" staan waarin beschreven staat dat iemand inputs van zijn eigen address gebruikt heeft om een transactie te maken met outputs naar jouw address, en dat je deze outputs nog niet gebruikt hebt (je address heeft unspent inputs).

Aangezien de databank volledig open en vrij te downloaden is, maakt men gebruik van een privésleutel. Om unspent inputs te gebruiken in een transactie, moet je deze transactie ondertekenen met je privésleutel. Iedereen in het netwerk kan deze handtekening verifieren, maar enkel de eigenaar van de privesleutel kan de handtekening maken.
Als er iemand in het netwerk aan je transactie zou prullen nadat je deze ondertekend hebt met je privésleutel, zal de handtekening niet langer kloppen, en zal iedereen in het netwerk je transactie verwerpen (alsof deze nooit bestaan heeft).

Jij hebt BTC gekocht van iemand, deze persoon gebruikte de unspent inputs van één van zijn adressen om een transactie te genereren met outputs naar jouw address.
Wanneer deze persoon failliet gaat wil dit noppes zeggen... Hij is niet de eigenaar van het netwerk, enkel iemand die de volledige databank (blockchain) had gedownload...

Zolang je in het bezit bent van de privésleutels dewelke gebruikt werden om via de publieke sleutel je bitcoin address te genereren, ben je in het bezit van je bitcoins.
In praktijk gebruik je ofwel een volledige client, of een SPV client. De client kan ook Deterministic zijn of niet.
Wat wil dit nu zeggen? Een volledige client download de volledige blockchain (de decentrale databank), een SPV client download enkel de blockheaders (veel kleiner). Aangezien de SPV client de blokken niet zelf download, maakt hij gebruik van een centrale server. Beide wallets beheren echter wel hun eigen privésleutels (de privésleutel bestaat enkel op jouw pc/server).
Een Deterministic wallet gebruikt een "seed phrase". Met behulp van deze phrase word een xprv en xpub gemaakt. Dit is technisch en onbelangrijk... Wat jij moet onthouden is dat als je de seed phrase backupped, er theoretisch niks kan gebeuren. Deze phrase is voldoende om alles te backuppen.
Een niet-HD wallet maakt constant nieuwe private keys aan, maar doet dit volledig random. Als je zulke wallet gebruikt ben je genoodzaakt om regelmatig backups te maken.

Even een laatste "tip": houd nooit BTC (of andere coins) op een online wallet of exchange, langer dan absoluut noodzakelijk.
Wanneer je een online wallet of exchange gebruikt ben jij niet de enige die access heeft tot je privésleutel, en loop je dus het risico dat je coins gestolen worden, dat de wallet je account locked, of dat deze failliet gaan.

https://bitcointalk.org/index.php?topic=1451483.0

I've never tried it myself, nor read the sourcecode, but apparently, it should work (or at least, it worked in the past)

I think that should be possible... If nobody steps up, i'll see if i can write something in python for this task this weekend.
6! = 720... So brute forcing that shouldn't take so long, as long as you're sure about both the place and the word of the first 3 seed words and the last 3, and be sure about the words but not the place of the middle 6.

If you're unsure about both the place and the word of the 6 middle words, it becomes (much) harder...

BTW, do you know any of the addresses that were managed by this wallet, that would make the task even faster, since the python program wouldn't have to check for balance after deriving the first key/address while bruteforcing...?

There are several options (look at my first post), i striked out the options that probably won't work, or are very difficult

1) if you used RBF, you can make the fee higher (don't think it's supported in coinomi)
2) you can use https://www.viabtc.com/tools/txaccelerator/
3) you can contact a miner, and offer a bounty for them to insert your tx in their block
4) you can attempt a CPFP
5) you can double spend one of the inputs of the transaction, to create a new tx with a higher fee*
6) you can wait, either untill your tx is dropped from the mempool of most nodes, or untill the tx is included into a block

* Theoretically, following https://coinomi.com/faq/ , it might be possible to use the seed words in order to find the private key(s) of the addresses which unspent inputs you used to create the tx that had insufficient fees (i don't recommand using online tools to find the private keys tough!!!).
The private keys can be imported into core (for example), and used to re-use the inputs to create a new tx (double spend, "cancelling" the tx with insufficient fees). Alternatively, you could use the coinb.in sourcecode in combination with the private keys in order to manually create a transaction double spending the inputs used for the unconfirmed (low fee) transaction.

BTW: offtopic, but i really don't like to see advertisements for those mmm-kind of scammy sites like the one you have in your sigspace. There are plenty legit site offering affiliate programs, no need to push scams on the forum.

As for the first part of the quoted text: please read my previous posts... 20k satoshi's is not sufficient.

About the second part of your question:
Which wallet are you using?
If you're using bitcoin core, you can start your wallet with zapwallettxes, or use abandontransaction from the console. If you don't do this, the wallet will keep on rebroadcasting the transaction. If you use these commands, your wallet will forget about the unconfirmed transactions, and you'll be able to re-use the inputs to create a new transaction. Be carefull tough: it's only your wallet that "forgets" about the unconfirmed transaction, it will still be in the nodes' mempool, so unless you spend the same inputs in a transaction with a higher fee (in satoshi's per byte), the "forgotten" transaction might still make it into a block.

If you're using other wallets, it depends... Each node can have his own configuration of their mempool. I think the default expiry is 72 hours, but you'll need the majority of the nodes to forget about your tx, so you can be lucky, or you can be unlucky...

No, 20k satoshi's are NOT sufficient. At the time of writing 63k satoshi's are needed  for a transaction with this size...

your transaction size is 520 bytes, you added 10000 satoshi's fee = 19 satoshi's per byte
https://bitcoinfees.21.co/ tells us that at the time of writing, it is advised to add 120 satoshi's per byte for a 90% chance of getting in the next couple of blocks.

In reality, you should have added at least 62400 satoshi's (0.000624 instead of 0.0001 BTC)

Your options are limited:
1) if you used RBF, you can make the fee higher
2) you can use https://www.viabtc.com/tools/txaccelerator/
3) you can contact a miner, and offer a bounty for them to insert your tx in their block
4) you can attemt a CPFP
5) you can double spend one of the inputs of the transaction, to create a new tx with a higher fee
6) you can wait, either untill your tx is dropped from the mempool of most nodes, or untill the tx is included into a block

Transactions are almost instant. As soon as you broadcast a transaction, it'll only take a couple of seconds before it's in the complete network's mempool.

However, depending on how much satoshi's per byte of transaction you added, you might have to wait a long time before a miner decides to put your unconfirmed transaction into a block (depending on the age of the transaction or the size of the nodes mempool, you might get dropped from the mempool of most nodes before you're added to a block in case you added really low fees).
Getting your tx in a block (1 confirmation) might be pretty fast, but it'll almost never be instant, since only 1 block gets added to the blockchain every 10 minutes (on average).

The lightning network is being developed for "instant" transactions.
http://coinjournal.net/a-simple-explanation-of-the-lightning-network/

Sorry, but after PM'in with a couple other trusted members, they all discouraged me to give out loans, apparently taking on accounts as collateral is risky nowadays... Apparently it's easy to get burnt, and you apparently even can get red tagged for giving out loans with account collateral... I had no idear so much changed over the last year  

Next time i'll thing twice before replying to a loan request, once again sorry for wasting your time!

Good luck tough!

I'm actually just leaving the office to go home in about 10 minutes... If you're still in need for a loan on monday, i can probably give you a 0.16BTC loan with your account as collateral with a 10% intrest rate.

TBH, i didn't know about the account prices either... I'm not an account seller, and it has been a while since i last gave a loan to somebody..

They already did this, the software is currently in beta: Epochtalk

Reference:
https://bitcointalk.org/index.php?topic=1442020.0

Please close this thread now. Thanks

EDIT: I haven't given loans for a long time, i was unaware that lately, the price of accounts became pretty low, and it seems like this account might not be enough to cover a 0.23BTC loan as collateral... Sorry*!

If you're willing to take less, let me know, a person with lots of green trust has PM'ed me and he's willing to hold an account in escrow if necessary.

*BTW: this does not mean that i think you'll scam me, i'm just not a risktaker... I can only give a loan if i'm sure that the collateral i hold would be enough in case of a default, but a trusted member has informed me that this might not be the case for this loan amount.

I can do 0.23 for 3 weeks, 0.253 repayment with your account as collateral... But only if you can give me a signed message with an old, staked, address (clearly indicating you give you account as collateral for a loan to me on todays date)...

I'm going out for lunch now, i'll be online in about 45 minutes. If you provide a valid, signed, message, and you let me (or a trusted escrow) secure your account, i can send you the 0.23 in about 1-1.5 hrs.

Sorry, i don't have skype (don't trust those centralised platforms without end to end encryption). If you have more questions, you're welcome to PM me tough

The first OPEN bid is 1211, but nobody is selling @ 1211, they're selling at 1223.17. There is a gap between the bid and the selling price, so the bid of 1211 doesn't find a seller, hence it stays open. The person making a 1211 bid is just hoping that a seller will come along that will agree to his bid, and sell him BTC @ 1211/BTC

If a seller enters the market, and he/she is desperate to sell BTC he already owns, he'll usually sell the btc to the bidder with the highest bid (currently 1211/BTC). If the seller is not in a hurry/desperate, he'll probably Ask 1223.17, or 1223.16, and his asking price will stay open untill a buyer accepts this price.

I get that you're new at this, but it seems you're mixing up the "buy orders" and "sell orders".

This exchange uses the word bids for the "buy orders" and ask for the "sell orders".
You can even visit a couple other exchanges and see some different wordings/gui's, maybe you can learn the difference if you see everything put into different words/graphs.

For example:
https://poloniex.com/exchange#usdt_btc

This is actually the real image  

It's up to you... There is one person who asks 1223.17, and he's selling 2 BTC. So if you want to buy right now, and you want to buy less than 2 BTC, a bid of 1223.17/BTC would suffice.

If you want to buy more than 2 BTC, you'll have to look at the next cheapest seller to: 1223.19 CAD$/BTC. At this price, you would be able to buy 2 BTC at 1223.17/BTC and 0.71621216 BTC at 1223.19/BTC.
So in total, you'd pay (2*1223.17) + (0.71621216*1223.19) + fee?, and you'd get 2.71621216 BTC.

Usually, you don't buy everything the seller has to offer, so you can also buy 0.5 BTC @ 1223.17 CAD$/BTC, and you'd get 0.5 BTC for (0.5*1223.17)+fee.

If you're not in a hurry, and hope the price will plummet a couple dollars over the weekend (it sometimes does), you can even make a little lower bid, for example 1200 CAD$/BTC, and hope over the next couple of days, the price gets lowered, and somebody is willing to sell you some BTC for this price.

The title of the table you posted in the screenshot is:
"Bids"... This comes from bidding... This means that the numbers in this table are from people who want to BUY BTC at a certain price, not from people wanting to sell their BTC.
You can make a bid of $1/BTC, altough nobody in their right mind would take you up on your bid

http://dictionary.cambridge.org/dictionary/english/bidding

The thing your screenshot shows is just the other way around... There is nobody willing to sell you BTC @ CAD$ 811/BTC... There is somebody willing to BUY BTC @ CAD$ 811/BTC

There must be a different table on this site listing the sell orders... The cheapest sell offer will probably be 1201.53 CAD$/BTC, since this is the price you're offered to buy BTC.

If you would place a bid @ CAD$ 811/BTC, it will probably not be filled, and it'll stay open, either forever, or untill the BTC price drops to CAD$ 811/BTC

There's not nearly enough info in this post to actually help you... I don't see any pictures, nor any links to the site you're using to buy BTC.
Nevertheless, i can defenatly tell you that nobody will sell you $800 worth of BTC for $538... If you think you're going to make this kind of deal, you're either mistaking or you're being scammed.

EDIT:
You seem to have edited your post, and added this image:


It's pretty clear: i think you're confusing the sell and buy orders.
This  image shows that some people placed a CAD 800/BTC bid. This means that there is a person out there who's only willing to pay CAD 800 for 1 BTC (who wouldn't). Chances are VERY slim he'll find somebody to sell him BTC for this price, unless the price plummets in the future and he keeps his bid open.

You can make any bid you want to, but if you want to buy BTC right now, you should make your bid equal than the cheapest price somebody is offering BTC for. You didn't include this column in your screenshot tough.