I had to roll back due to this bug. When editing Bezier masks in the Event Pan/Crop dialog, after a short time cursor sync stops working for no reason. Toggling the setting has no impact. Closing and reopening Vegas only works for a short time. I use this feature heavily so had to rollback.

With build 428 he only issue's I'm having are a few crash scenarios which, if thinking about it, can be avoided by saving frequently and annoying error messages after loading some projects - apparently due to audio codec, though the message is benign.