EDIT: hmmm... I may have misunderstood the problem.
My answer is if you are talking about doubleclicking on a midi clip in TV.
/edit
It's a known issue.
A couple of things you can do.
1. press SPACEBAR to start playback, and then SPACEBAR again to stop.
or
2. Do not have the PRV maximized so that the project timeline is visible. Left click in the project timeline and the PRV timeline will update.
I prefer to use the second method myself.