I have encountered all sorts of issues, but I don't remember that one specifically. SOmetimes it's a little slow to respond and things get all crazy, so I just delete the filter in Vegas and start over.
Boris can do a lot of great stuff, but I'm still not sure about it's integration w/ Vegas. I still use it as a stand alone rather than a filter.
Deleteing the filter in Vegas is where I find the problem. Even if it's just slow to respond or completely locking up, it's way too much time spent waiting.
The "template mode" is great though. Just got to get it working right.