The master public key you sent me has NO HISTORY AT ALL.
This means, your seed is wrong or there's an issue with the formats changing between the new versions and old versions of the electrum client.

The seed format has changed since the first wallet realease, I'd suggest you try this with your seed just to check it. This one supported MPK keys and is the latest one I can find that does (though I didn't do too much of a search, though my seed was generated from 2.6.3).