Thanks for your reply.
I can open the editor directly. I did not change any files before updating to PSE 12.1.
When I open the editor and organizer directly I also notice that one or both fail to unload when I close it and continues to run as a background process which I cannot close with task manager.
The programs behave best when I start with the opening screen, open the organizer from it and then open the editor from the organizer.