I'll pass that on, but if it happens again post in the Steam forums (there's a Beta section) or our official forums because that's the two places that the CoH dev team is watching. I don't think those guys are here that often because they're programmers and server techs not designers.
First, thank you and everyone trying to get things up and running, I appreciate it. Looks very promising and has got me pretty excited.
I posted the same thing Pepsi just did in the official forums. When I exit the Beta version, I get the c++ error as well. The error says, "assertion fails" and asks me to retry, Ignore or close.