Sounds like a Defence+ rule blocking something. If it was me, i would examine any C:\windows rules in D+ and if i could not find the right one I would delete and rebuild D+ rules.
You have probably already thought of that, but thats all I can think of at the moment.
Sorry for bumping, but I have this problem too, and as I didn't see any solution to it, I decided to take it up again.
I would like to know where I can access these D+ rules, and how do I delete them, and how exactly is it built up again? Can you give me a little more detailed explanation?