I am using a MacBook Pro with OS 10.11.3 & Lightroom 6 (2015) standalone (i.e. NOT CC). On launching LR I receive the following message: "Lightroom encountered an error when reading from its preview cache and needs to quit." + statement that LR will attempt to fix the issue when restarted. On restarting, the issue is NOT fixed, resulting in a program that is not usable.
I have uninstalled & reinstalled, getting the same results.
Any answers out there? How do I contact Adobe?
Many thanks. The link had the answer that worked!!!
You are Welcome, Glad to help.