I have C1 and occassionally experience that too.  Just reboot machine..... works for me.  Haven't found any other solution

Well I have no answer why this is now working once again.
I was loading each project from latest to earliest taking snapshots of plug-in settings etc. ready fro migration and when I got to 4th project all of a sudden the Console 1 display screen opened up and I had full control again.
Loaded 1st project and it was now working there, next day loaded 1st project and it is still working.