I tried to update DirectRT to a newer version of the beta, but it seems that the most recent update is the version we're already running (2010.124.820.10). Is there another way to get the update?

I know that the version of the beta that was available Nov/Dec 2009 did not have this problem on these computers b/c I was pilot testing a study with it and the primes weren't visible.

I'll await the results of your testing.