I just downloaded 2.030 and to my surprise (and dismay), the entire program compiled and ran without modification...  It's a multi-threaded application!

I've created the following ticket which may be the root cause of why things compiled without error. http://d.puremagic.com/issues/show_bug.cgi?id=2992#c1

I'm not sure how this should be fixed, but I think it's a critical bug if we want to claim that D2 helps us address threading issues.