I changed nothing, but now get the "cloned catalog detected" error message. And, the only photos that LR sees are the ones that I have previously synced to the cloud. It does not see the many thousands of photos on my hard drive, and I see no way to connect them.
Thanks for your response, Rikk. I don't see anything attached to your reply. I tried to attach a screen shot of what I see when I open LR to this reply, but cannot. I cannot find anything that allows me to import a catalog. The file structure on the left represents all the photos I have synced with LR Mobile, but does not include anything from my hard drive. I cannot figure out what has changed.