Unfortunately I have the same issue with version 0.39.9 running on W7 64 bit. The program freezes a lot and most of the time it reacts again after 10-15 seconds. But sometimes it completely crashes.
I am not aware of any changes to my system over the last 4-5 weeks when the problem started (besides the MS patches, of course).
Any idea? How can I help to troubleshoot?