same problem - even worse! moving the master slider: no reaction: freezes for 30 secs. later, after a minute: freeze ends BUT slider moves to the position i wanted to set with the mouse! catastrophy! for me: vegas 14 is buggy even 211! never had so many probs with sony movie studio 13. very disapointed. would never recommend this buggy thing to any of my friends!
The fact that this issue has been around for so long but quite rarely reported indicates that it's specific to some aspect of certain systems, and difficult to repeat, therefore difficult to fix. So instead of complaining, let's try and find out what causes it:
i stoped reporting, because i never got a feedback with other vegas problems... (freeze with 2. screen (fullscreen preview).
Please don't give up on reporting bugs. It's still the best way of making sure Magix are aware of the issues, and the more reports they receive on the same issue, the more likely it is to get priority. I have received replies to most of my reports, although the replies sometimes take a long time coming, and a pretty good rate of seeing things get fixed.
If anyone else has this issue, please post the same info so we can see if there's a common factor. Previous discussion here and here.
(p.s. Here is a recent case similar to your 2-screen issue. Maybe something in that thread can help you)