Thanks, everyone. I didn't want to go into a lot of detail with that post, so I just generalized saying I wanted to turn off the changes. Actually, I found out that the changes I wanted to un-change were by WindowBlinds. I got both programs at the same time, along with CursorFX and IconPackager, and there's a lot of overlap as to which does what. Kind of like a kid at Christmas unwrapping different Legos sets, or something.
Anyway, the issue I had was with Thunderbird email client. The upper right icons on the header had disappeared into a black rectangle (see the image), and it was stuck in Maximize. I was blindly guess-clicking and could get it to Minimize and Maximize, but I could not find Restore. (Note: the "kill" icon doesn't kill, it minimizes to the tray)
So, pointing WindowBlinds to Windows Default corrected that problem. This is bound to be a known issue, but I haven't had time to look for it. Later I will see if I should report it and gather up some info and screenshots, I guess.