I reproduced the problem when hitting F4 to preview the game, but instead of keeping watching the loading screen I clicked to see the forum and it popped up.
<img src="https://dl.dropbox.com/u/47035927/temp/crash_report.png" border="0" />
It's random and I tried to reproduce it again in video but nothing happened.
Also, no third part is installed, no plugins, only the C2 as it is.