I have fixed the problem. Well, you fixed it, Virtuali, but not in this thread. I noticed there is another thread about the bglmanx.dll file and that file was mentioned in that error file I attached to my previous message. In that other thread, you went into the DLL.XML file at great length describing how the Add On Manager used to be inserted at the top ahead of all the other add on entries, but with this new upgrade, you elected to append the Add On Manager entry to the end. I keep a copy of that file so that when I install something that edits that file, I can always get back to a good state. In my copy, sure enough, the Add On Manager entry was right at the top. After moving the Add On Manager from the bottom, where it was put after updating GSX, to the top where it used to be, it fixed the bglmanx.dll problem, the simconnect problem, the missing AFCAD information problem, and the failed airport cache generation problem. I've tested things and everything appears to be working as it should. I did, though, have to reboot Windows to get everything lined up again.
Thanks for the lengthy discussion about the DLL.XML. It's a tricky little file, isn't it?