One of us (me and Launchywiggin) were not able to finish the action.
We tried undoing multiple times, reloading the client etc.
The specific spot was after he played golem to play mountebank, I discarded a curse from my hand, confirmed it, and the game basically froze. This happened multiple times.
Had the same problem with golem + sentry, tried to undo a few times and the bug kept cropping up in the game, here's a game log and some screens:
https://cdn.discordapp.com/attachments/264784149666201620/265302831454486528/unknown.png
https://cdn.discordapp.com/attachments/264784149666201620/265303220052688896/unknown.png
http://imgur.com/a/1eJ41