One thing I noticed when using this exploit, is that once you use it on a box, you will have to restart the popped box in order to run the exploit again. It is very weird. We had a bunch of people working on a Windows box in a MSF breakout session, we only had one Windows VM running.
It works on the current revision, which is 9478.
 after talking to the guy that was in charge with the VMs that night, he had too restore the snapshot for some reason. I'm not exactly sure why that was.