How many files are in the "wallets" directory if you select "file -> open"?
If you have multiple... Do any of the other wallet files contain the same addresses as the wallet restored with your seed?
I should but i can't. I'm sure about the sed words, sure about the password. I make three copies of it. I have only 3 wallets, i check the password of each and the seed , everything is in the right place. I try old versions of electrum. I try in a second pc.
I don't know what to do seriously. I am sure the wallet is corrupted, because normally i can restore an older version. On this particular wallet, i can't.
My only chance, it's maybe to restore the old password but i don't know if it's possible and how to do it.
I only use this wallet when i change the version. I am sure that when i install first the 3.4 version and 24 hours later the 3.5 version with changing the password, it makes something about the wallet and the password...