It might be the same problem that Section 8: Prejudice had: I had to disable (disable and reboot) the Defence+ side of my comodo internet security package.

Its out on the net how to do that, but basically, you have to go into the options, and explicitely click "disable defence plus for this system, reboot required"

PS: Im posting here because the comment system is horribly horribly broken for me and wont even let me login.