I opened up my LR yesterday to find that instead of 21,000 photos in the programme I have just 64. Before that a message popped up to say something like 'This programme cannot be opened as it is being used in another application'. But I can't find it anywhere. All attempts send me back to the 64 photos in LR. Can anybody help. CP
Sounds like a previous running of LR did not close down correctly.
Exit LR if it is running.
Using Explorer/Finder, go to the folder containing your catalog (*.LrCat). If there is a file with the same name as your catalog but with a .Lock file extension, delete the .Lock file. (Delete nothing else.)
This should get you back into the catalog you are looking for.
I think you are right. When I opened up it was running but then power went! Thanks I'll try that.
Please buy and use a UPS. No desktop computer should be without one.