Solved it - thank you.

Just did - now it is telling me: unable to broadcast and missing inputs. This is irritating me.

Thanks. I am now receiving broadcasting error: The server returned an error when broadcasting the transaction. Consider trying to connect to a different server, or updating Electrum. bad-txns-inputs-missingorspen

Any ideas?

Thanks, also, how do I check my updated Electrum balance?

Accidentally paid a vendor in mBTC instead of BTC and I am now worried that I will not be refunded. Where does the money go if the vendor does not accept the mBTC? I am a newbie in case it took you this long to deduce. I hope I don't have to pay again.