I seem to be having the same issue, and i'm not alone. When is the next patch? Cause hopefully they can fix it then.
Thing is, i managed to temporarily fix it by restarting my computer. However that doesn't seem to work anymore. I've Turned off my firewall, to the best i can and still nothing. Also, i've tried running without the desktop shortcut and as Administrator (vista) and still nothing.
I'm gonna try and find a workaround, but if anybody else has the same problem, and/or the solution to it, that would be awesome.
- Mehozzy