I am hoping to avoid re-installing so I hope someone has some ideas as I am out of them.
My computer just went black when I was importing a rather large quantity of new RAW images. After about 30 minutes of this black screen I decided it wasn't coming back and I turned the computer off. Now, as I try to open LR, it gives me a false ray of hope as it opens only to have an error box pop up about 30 seconds later. The box states: "Lightroom encountered an error when reading from its preview cache and needs to quit." After which I can only shut the box down which shuts LR down.
I have tried all of the normal fixes from the obvious reboot to trying to repair it from Control Panel but I get a dead end error message with everything I try. I even installed the 5.6 upgrade hoping that it might either solve it or install a new version that was better with out having to reset up all of my catalogs.
Ok what you need to do is go to the folder with your Catalog inside and remove the folder with the name ending with Previews.lrdata.
This has become corrupted with the crash.
It only contains the previews which can be rebuild as needed by Lightroom or you can select files or all of the files and use the command Render Standard Previews in Library Drop Down Menu.
These seems to have worked as my LR is now running, Thank you. If there is any doubt on my part, it is because it somehow started with out the error just before I did this, I went ahead and did it anyway as I was pretty sure the crash was just delayed this time. Thanks again.