I had already tried switching to the default theme and it didn’t fix it.
I thought it was due to the wp-super-cache plugin, but that didn’t seem to fix it.
HOWEVER, I was out of WordPress all day and just came back to the admin console and I could see the Pages again. I have no idea how or why this happened, but it did.
So it’s resolved for now, I guess, but am not sure how. Will post back if it happens again.
Next time I will deactivate ALL plugins as a troubleshooting step.
I decided to bypass the WordPress upload manager and opt for a plug-in instead. I am now using Image Manager and it is pretty impressive.
