"Cannot open Lightroom 5 Catalog because another application already has it open"
Would anyone know how to deal with this problem? LR is up to date. I have images due for delivery.
Thanks for any comment!
Restarting your computer would be the first thing to try.
This is most likely caused by a "lock" file. It is created if Lightroom is not closed down in the correct manner.
Jim Wilde has a great answer to a post on lightroomforums.net
It was a 'lock' file indeed. Thanks!!