Hey Rob,
I've been having what I believe is the same issue, but I'm fairly confident I've found the fix for the issue. I was checking with Cameron to see if perhaps I can help him.
I am running 1.1.1 and I have seen this issue only on Windows 2003 servers so far. I might have a Linux server with the same issue, but I haven't had a chance to confirm. I found the following Microsoft KB article relating to my issue and I was able to confirm it fixes my issue on one server. We are planning to push out this fix via SCCM some time in the near future.