Various forms of problems with project ending are being discussed regularly.
I think I noticed something funny yesterday. I've had many inexplicable cases when a project suddenly "forgets" its ending and plays back forever even though there are no events after the last clips. Like the one I worked on yesterday. If I "Go to" project end, it goes to the right place, the end of the last clip, but if I play it back it goes on forever.
Accidentally I noticed that this seems to occur when I archive a track. I'll have to double check that, though.