(Relative novice user question) I created a timeline with clips from 8 cameras and managed to align them via audio, even though some used time codes and some did not. (I had to do this manually as the Auto Align Clips control was disabled.) After doing this, only the last track added will display in the playback window, except when it had no content, and some other clip would display. This happens regardless of which track is selected on the track header. In case it matters, most of the tracks contain a sequence of clips, not just one per track, and not all of them overlap at the ends. I tried quitting Da Vinci and restarting it after quitting browsers and other programs using lots of memory, but this made no difference. Has anyone seen this before, and is there a remedy? Thanks.