Just learned a new trick from dominionfan457 (rating=56). Instead of resigning, try to undo back to the very beginning of the game. If that doesn't work, then just disconnect.
Horse gains don't count toward commerce gains. Twice in game, I gained a horse, province with dominate, and card x. Afterwards I then bought commerce, and only was given 2 golds. It's possible that the province gain with dominate is where the logic is broken, but I'm guessing the problem lies with horse gains.
When I discard more than one village green at once (for example, I discard 2 VGs with one warehouse), it only allows me to play one of the VGs, and then says something like "VG has already been moved and cant be moved again". This happens regardless of deck shuffles. I'd expect to be able to play both discarded VGs, but it only allows 1 to be played