I've tried ALL of the above and NOTHING works.
Here's the funky thing. If I switch users at log-on and go to any photo folder, the thumbnails show perfectly. Going back to my default user account the thumbnails flash and disappear.
SO.. There must be something that is set weird on my default user account.
(both accounts are set to admin)
Yes, all the thumbnail boxes are set correctly, the default for the extension has been tried, thumbnail cache has been cleaned (and even deleted in the \local\windows\explorer folder.
All drivers have been updated, and registry is in good order.
What can be different between the 2 users accounts that will make them show on one and not the other?