OK, thanks, I'll try this (not much time right now).
Another thing is that the whole workspace has been re-set & I cannot get it back to how it was; I had saved it under a name, but when I click on this name it doesn't go back to how it was before. In the space on the left I always had the favorites as big thumbnails at the top, & underneath this the metadata for each photo that I highlighted. Now the metadata & favorites are all in tabs, so I cannot have them open at the same time. It'sd quite annoying. I cannot see anything in View / Window or Preferences to set this back to how it was before.
Thanks for all your help.
but when I click on this name it doesn't go back to how it was before.
Clicking itself is not enough, you either use right mouse click menu on the name or choose the triangle next to the workspace name and inhere select reset window.
There once has been a battle going on between the group of users wanting to reset the workspace with click on the name and one that did not want that to happen.
I'm still not sure what my pref would be, sometimes I change my workspace a bit and want it to keep it this way while changes workspaces, sometimes I'm annoyed it needs an extra click to reset. As always, it is very hard to please everyone 
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