Thanks for your reply. When I started using my PC this morning, it had gone through the normally scheduled routines: Malware anti-bytes, AVG antivirus, PC Clean and PC Maestro. Everything cleaned up, registry issues (2) resolved, etc. After I restarted the PC, I checked the Facebook and eBay sites. Now everything is working normally.
I guess one of the apps repaired or fixed a faulty file? Anyway, thanks for the assistance. Even though I didn't need to do it, I'm saving the screen-print info for future reference.