When you "Exit Editor", it returns you to the surface you were on previously. I have stumbled into a situation where the surface I was on previously is a different processor that no longer exists, so it does not allow me to exit the editor at all.

It would be nice in this case for it to know where my previous position not inside a processor was to return me to...

This can also occur if you enter a circuit, then via map view enter the same circuit you are already inside. Exiting it then brings you back to it, sticking you in an infinite loop.

Thanks for report. In 2.0.11 you can click "Exit dialog" with <control> key to exit all processor.