Flash fullscreen issues with Firefox 3.1 Beta 3 and VBox

When I try to play flash videos in fullscreen in Firefox 3.1 Beta 3 or in any browser in VirtualBox, it hangs and I have to send the sigkill signal to the app in the console. Running Firefox in the console gives me a glibc memory error. Flash videos work fine in Firefox 3.0.8. In addition, all Java applets hang as well. I have no idea where to begin to find an error log for this.

I have a feeling this may be due to the 180.44 nvidia drivers that I installed. Is anyone else getting this issue?