On 2 separate occasions I tried buying farmhands and setting a treasure aside (stockpile on turn 14; King's court on turn 17), and then in my next turn I was not able to play any card. I tried undoing/redoing and reloading in Chrome (I usually use firefox) but the bug persisted.
I ended up undoing and taking a different action instead, which is why these do not appear in the log.
Game ID = 158751005
Thanks for the report, including the gameID.
Unfortunately, I can't reproduce the problem. Whatever I do in turns 14 or17, the Treasure set aside is played on my next turn and I can continue. I don't doubt that something happened, it just seems it is a more special circumstance than "set aside a Treasure when gaining Farmhands".
I'll look out for future reports.