I found some other reports of the Unity webplayer crashing, you should try these steps.

1. Close down all open browsers with command-Q.
2. Open up a new Finder window
3. Press shift-command-G...

Sorry, I couldn't reproduce this problem. I tried Mac 1.292 both with playing Darkclaw + Speedstrike and replaying your games, and they worked fine with no crashes.

Can you describe exactly what...