So here's what I'm doing:#1 The preview stopping is still a thing, but they are working on it...
1) I create a new comp
2) I throw a bunch of short loops in layer 1
3) Trigger the first clip in layer 1 and set layer 1 to autopilot random
4) I throw a clip in layer 2
5) I preview the clip
At this point, I can keep previewing the clip till the cows come home. It stays visible in the preview. It doesn't seem to matter if I'm previewing the actual clip, or layer 2 playing the clip. In both cases, the preview stays live throughout the random triggers in layer 1.
We'd love to fix it, but as far as I can see, it's working as it should. Maybe you can see what I'm missing?