I guess all game devs that posted here are using win7? Because I tested it on my WinXP SP3 and when I tried to close the demo via red button I saw a message from 'Data Execution Prevention' (DEP) for the first time in about 10 years of using Windows. It gets active if a program code tries to execute from protected memory (non-executable parts of the memory). After closing the message the space blaster demo crashed. To stress that: There were no issues as long as the demo was executed, only when trying to close it the protection gets active.
@Ashley: Is it a bug in Awesomium, or in C2? Or is it simply incompatible with WinXP?