Hi,
I had earlier noticed this problem is Vegas Pro 18 and now in Vegas Movie Studio Platinum 17 also.
Normally the timeline should stop playing after it reaches the end of the last event. However, in both the above software's, it is not happening. The timeline continues to play even after it has reached the last event.
I am not sure if this is a bug or the default behaviour. If it's not a bug, then is there any setting to prevent this behaviour?