(context post by knightmb)

You are using Windows I can tell, but what version, arch (32 or 64 bit) ,etc?

http://bitcointalk.org/index.php?topic=316.0

Maybe that thread helps.

More directly, this: topic 246

I will be posting release candidate of 0.3.1 with this fix shortly.  Please try that and let me know if it fixes the problem.