Hi Pete,
As to the problem of the Add-Ons not appearing, I have noticed that whenever it happens to me it is when I load FSX after having been on-line.
I can load FSX from a cold boot and as long as I haven't been on-line, the Add-Ons appear everytime, no matter how many times I load and shutdown FSX. If I have been on-line, then log off, the next time I load FSX, the problem will occur most of the time. Not always, however. When it does occur, the next time I try to go on-line, I connect to the internet ok but no web pages will load. Says server can't be found.
The only cure then is to shut down and reboot the puter.
Don't know if this info is new to anyone or if it will help in trying to figure this thing out.
Jim