Problem solved  Single word in mnemonic was in different language which I was completely blanking on the 20+ times I input it. Quite possibly the final line of defense put there on purpose by self!

Thanks, not sure I would have spotted that if you hadn't shown disbelief at it not functioning!

I mined back in 2012 and had an Electrum wallet (0.59b). I have the mnemonic, and am able to restore without error in the newest version of Electrum, but the address generated is different (and empty).

When inputting my seed I must check "BIP39 seed" under "Options" or it will not allow me to press "Next". I did some research and found mention of the changes made going to version 1.8+, but I was unable to find any mention of this impacting a restore with a seed from before this time.

Another note that I do not see how could be relevant (but wth) is that I make no changes in the wallet derivation ("m/44'/0'/0'") formula.

Any help?