To answer the questions about the seed and how i imported them, no, the seed is not wrong. Clarification:
I swept my private keys from a cold wallet following someones instructions 2,5 years ago. I had 7.2 btc back then, and i did this with no problem, i sold 0.6 sending that from the USB. So this wallet has worked in the past. The last time i checked and it connected and had the remaining 6.6 btc was 1.5 years ago. Now, everything has disappeared.
I do have the correct seed. Ive checked it from the electrum seed and typed my password, and it shows me the same seed i have written on paper. So it is the correct file, i have the correct seed, it worked before and ive used it to receive and to send, and now there is no proof of any of this and i cant see my coins.
And what comes to choosing the wrong wallet file, i made a specific name for this wallet so i know its not the wrong one, but ive done the same to the autogenerated default wallet that was created in electrum to which i also have a password. So to answer whether or not my wallet file is wrong, ive tried it with the other file too.
"What node are you connected to. Go to tools > network and check the block height in comparison to the block height of the landing page of blockchain.info.
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How do i do this more specifically? Where do i see the block height?
"It is also possible that for some weird reason the addresses with the coins are out beyond Electrum's default gap limit of 20 "receive" and 5 "change" addresses.
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What does this mean? Im afraid im a bit unfamiliar with the terminology (and it seems, once again, that i have bad karma with technology
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If what you mentioned is the problem, how would i go about finding out whether or not thats the problem and how to fix it?
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Are there other possibilities beyond the mentioned, and also: is it possible to get the private keys of the wallet out of there and import them somewhere else to see whats going on? I also heard that if this is a connectivity problem something called a "rescan" should help, whatever that is. I tried googling it but i found nothing. Is this true?