Sorry forgot to write down server/game-id.
I had 3 coppers in hand, opponent had Highwayman in play, so I was affected by the attack.
When i click quick-buy on a $2 Peasant game plays two coppers and fails to buy the card, leaving me with $1 in play but also unable to play additional coppers for some reason.
A simple undo solved the situation this time, but i can imagine this bringing about similar issues in many types of games.
Thanks for the report! We are aware that Highwayman and autobuy is bugged in the way you described. The workaround for now is to play one Treasure to be nullified, then autobuy should work again. But of course we look for a way to handle the whole situation better.