It seems that tracks are randomly disabled. It happens right after, or a few seconds after I've gone into PiP Designer, Motion Effects, and adjusted a Fade In or Fade Out. Sometimes they're not disabled, but when I press Play in the Preview it only shows the clip I've just edited. If I then switch to Movie, all of a sudden the other tracks are disabled. Sometimes it doesn't even seem to be the same tracks, just some of them, quite randomly. The type of tracks that are disabled can be any, including Music which of course has nothing to do with PiP. Even locked tracks.
What's this about? Is this some functionality that I don't understand, being a newbie, or a bug?
Brgds
Danny