Ok, been having trouble due to bugs.
Something seems to have gone wrong with my install since I had the invalid workspace error and have been unable to resolve it. Rolling back to a previous version didn’t help or may have made it worse, as - they DIDNT have multiple screen workspaces.
SO I had to do the Reset, as advised by Marf - but lost my list of worked on sites. meh.
Then Multi Monitor workspaces worked again! Score!
But then, issues with Bootstrap 4, not appearing to add resources to the project on save.
Unable to close project
I’m afraid it had to be totally reset -SO these are the files/directories which I have removed.
If there are others, let me know.
I’ve only ever had to do this twice. once after the CMS version trial when I couldn’t get it back to the full version again. -which I suppose is pretty good for running an app for a little over 4 years!