For some reason fluid softbody and armatures seem to crash on OS X a lot, even with simple scenes.
Often the few first frames work and then it crashes.
http://www.blendswap.com/3D-models/misc-objects/blendera-blowing-flag/
Here is a video of what happens:
http://cl.ly/0f1U0V3u0O0I3Y123D23
Here is a video which also shows that the mesh disappears when I go into edit mode.
The cache can easily be corrupted but a free cache command does not reset it and Blender does not recalculate it.
http://cl.ly/3p0T0x1M2n1b2J381T3V
Crash Log:
http://www.pasteall.org/25219/text