Whenever I open Lightroom all it displays are grey boxes in any view or configuration (see photo). I have reinstalled Lightroom several times, deleting all of the associated files in app-data as well as the photo catalog and preview cache. Any ideas? please help!
It seems that some of the photos are missing which means that the original images were moved, renamed or deleted outside Lightroom.
You need to relocate those images to their originals.
Refer this article for instructions : How to find missing photos in Photoshop Lightroom
If you see other images with grey images, refer this link to calibrate your monitor and then, check : http://www.lightroomqueen.com/articles-page/how-do-i-change-my-monitor-profile-to-check-wh ether-its-corrupted/