I was getting the error message for LR 5.3 64 bit about LR needed to close due to a cache error.
I did some research, supposedly how to fix the problem. I found LR in My Pictures. Opened the file and found previews.lrdata and deleted it.
I was then able to open LR but I realized most of the files in LR catalog were now displaying a ? and I was missing a number of files and images in LR.
I found the file in recycle and restored it hoping that would solve the problem. It did not.
Not only am I still missing reference to a number of images, the ? is still being displayed. Do I need to go back to catalog 5 and choose restore previous session?
I can now at least open LR.
Thank you for any help!!!
P.S. I use windows 7
Fixed the problem, by finally finding the right file to restore.