I checked the compatibility settings. LDS.org was not listed among those. To be sure, I removed all from the compatibiltiy settings, closed and reopened my browser. Same problem. I do have a continual circle (hourglass), so the system pretends to be working, and I also tried the 32-bit version.
So... nothing serious. I was hoping for a quick fix, but I can use another browser or XP mode if needed. Even better, I have an excuse to provide Ward leadership for not uploading our family pictures.