BUMP
I have the same problem like the OP… I cannot select the insert/send/Track Version/main section in the inspector – and it is really annoying because i cannot set a track delay because the main section of some channels is not accessible???
the only thing i see is this little cube which says “preset management” when i hover over it…
when i click some tabs very often it kind of works some times, but I only see half of the UI and it reacts very strange 
I have no idea what caused this problem. I closed the project yesterday (normally), opened it today and suddenly this annoying issue was there… Does anyone have a solution for this problem??