when prompted at the re-opening of FSX I selected "do not run addonmanager ever" or something to that effect.
Now my Cloud9 Orlando FSX and Dreamteam Chicago O'Hare FSX are missing the buildings , and so is Greystone..
That's normal. If you haven't trusted the Addon Manager, nothing will show up.
So how do I reactive my addonmanager, I assume this is the issue .( I don't want the addon manager prompt at the begining of every FSX startup though )
It will not give a prompt every time you start FSX. The question to trust a module is made just ONCE, when the module is newly installed, or has been updated. After you reply "Yes", both to the Windows question (that one with the Yellow shield indicating the module is digitally signed) and to the FSX question, the prompt will never be repeated again.
Now, you need to "reset" FSX to give you another chance to answer the question (this time, please say "Yes").
Open this folder:
%APPDATA%\Microsoft\FSX
open this file:
FSX.CFG
with a text editor (notepad is just fine)
Search all the lines with a reference to bglmanx.dll and a series of random characters after the name. You might find more than one line like this. Delete them all. The whole line.
When you don't find any other line like that, exit and save the file.
Launch FSX, it will make again the question about running the Addon Manager. If you reply Yes to both questions, it will never prompt you again, until the next time that module is updated.
If you don't want to see that question ever, even if the module is updated, you can choose (click on the down arrows that say "More options" on the first question) to trust everything that is digitally signed by us.