Since yesterday i can not open Lightroom. It says that the Lightroom Catalog can not open because it is still open in another application. When i look i have no active programs. All this started after i had to force shut down because the PC got stuck. Anyone for some help? THX!!
When Lightroom is opened, a lock file is created to prevent others from accessing the catalog. Normally, this file will be deleted when you close Lighroom, but if it doesn't close down properly because of a freeze or a power failure, it might not be deleted. You will then get an error message saying that the catalog is open in another application, and you can't launch LR.
Using Explorer/Finder, go to the folder that contains your catalog.
Delete the file that ends with .lock. Don't delete anything else. Now try to launch Lightroom.
Thx Per, this was solved in no time!!