Game #1313699 on frankfurt (I think frankfurt, forgot to write that down.)
Two weird bugs that don't really fit a category:
Opponent grants Undo.
Opponent receives request to undo 1 step
Opponent receives request to undo 79 steps.
Autobuy option is on.
Hand contains 1 Silver, 4 Copper (6 coins total)
Click Avanto to buy Avanto using autobuy.
Autobuy plays 1 Silver, 3 Coppers
Game asks if I desire to trash the remaining Copper
Click to trash remaining Copper
Autobuy buys and gains Avanto.
Automatically end turn (no Buys remain).
Autobuy plays 1 Silver
Game asks if I desire to trash a card.
Click to trash one Copper
Autobuy plays 2 Copper, leaving 1 Copper in hand.
Autobuy fails to buy or gain Avanto (because only 4 coins were played)
Game will not allowing playing remaining Copper even though no Buys have actually been used.