For several versions, this feature is default to off when restarting Vegas. Not sure why the Vegas Gods in their infinite wisdom decided to turn that to default off. Just another annoyance. something else I need to turn on every time I restart. PLEASE GUYS FIX THIS, just done flame me for suggesting something might need to be improved.
@Joe-is-Hungry-Channel In build VP23 build 302 my Auto Preview button stays on when restarting Vegas, but it doesn't function unless the Enable Hub Scrub Trimming is also on.