I am unable to open LR and get message 'LR encountered an error when reading from its preview cachs and needs to quit'. I have uninstalled and re-installed and still get the same thing???
Delete the preview cache. This is a folder whose name ends with Previews.LRDATA, it is in the same folder as your catalog file.
Only delete the folder whose name ends with Previews.LRDATA. Do not delete anything else.
Thank you very much, seems to have worked.