Sometimes in a project one or more tracks will disappear from Track View. I check Track Manager to see if they have become hidden, but no they should all be visible. Switching to a different screenset, the tracks are visible. Back to the original screenset and they are gone again. Close project, re-open it again and everything is back to normal, thank goodness.
 
Anyone else seen this behaviour?

There is a bug when a soft synth is inserted.  The order of the tracks seems to get confused, this might be your issue or it might not.
 
Simply take the last track and move it up above the track before it and move it back.   That should set everything correctly.  You may have a different problem, but I know this problem I just described does exist.
 
Jerry
www.jerrygerber.com
 

jsg
There is a bug when a soft synth is inserted.  The order of the tracks seems to get confused, this might be your issue or it might not.
 
Simply take the last track and move it up above the track before it and move it back.

 
Thanks, I try that next time.  However I don't think it occurred after inserting a softsynth and I didn't see any tracks displayed out of order, but I could be wrong.