pictures not showing in filmstrip
I am running Lightroom Classic v 12.1 on Windows 10. Creative Cloud says I am up to date.
I have a problem that just started today.
For my drive E (which is where most of my photos reside) In the Library module, my folders show a number to the right of each folder name indicating the number of photos in that folder, but the filmstrip at the bottom shows 0 photos. Any folder I click on shows 0 folders in the filmstrip at the bottom. (I've attached a screen shot showing the problem). For drive D or F, I do not have this problem.

Also, I notice that under the Catalog window in the upper left it shows
All Photographs 119838
All Synced Photographs 1846

Did my photos become unsynced? I have tried right-click Sync and it runs a long time, even on folders that only have a few photos. (I've waited about 20 min and then canceled the sync.)
I would appreciate any help to solve this problem. Thanks!