Played a game (tournament time ctrls) with Crafty,
1. e4 e5 2. f4 exf 3. Nf3
and Crafty hung. It was doing analysis, I could the
analysis running but it never moved and ran out of time.
Logged In: YES
As a workaround you can right click in the Engine Panel and
select "Restart Engine", then press the "Play" button.
It's hard to tell what actually caused the problem...