It is always possible that we have a bug, it is beta. But, about 10K people are running it now, and we are not getting emails of similar problems from people. You are running an ATI card, and one of the many ATI models that seem to have the most problems. Here is a whole web site devoted to ATI crashing.
http://www.hardwareanalysis.com/content/topic/1075/
"Most" errors magically happen on ATI systems.
We are planning to start a database, and track every "crash" like this. Although the count is in the single digits, there is a pattern.