I have a multicamera edit project, the source and target timelines are set up as required. I've performed the multicamera edit and saved the file. When I open the saved file, only one track in the source file shows up in the target sequence. All tracks in the source sequence are visible, the file was saved exactly as it was when the multicamera edit was performed. It looks like a bug to me.
Hi Steve, which version of Premiere Pro are you running?
I just updated to the latest CC, and it looks like the problem has been fixed!