Lightroom will not open. It's giving my an error box that says there's already an application accessing Lightroom and that I need to close the current application before I can open Lightroom, but there's nothing open and I've restarted my computer multiple times. HELP!
In your operating system, go to the folder that contains your Lightroom catalog (it's name ends with .LRCAT), and then delete the file in that folder whose name ends with .LOCK. Do not delete anything else.