I have followed directions to the letter when it comes to uninstall, disable the anti virus then install again blah, blah, blah. This last time I just decided to uninstall my anti virus completely and I figured the sceneries have to work now
This seems to indicate the culprit was the antivirus, in this case. If you had to uninstall it entirely, you must have skipped some step, otherwise it wouldn't have been fixed with a complete uninstall.
Rather than uninstalling, I suggest using an antivirus that doesn't create the issue to begin with, like the free Microsoft Security Essentials, which is what we test the scenery on, and we keep it constantly on, without any exclusion, without turning off, without doing anything special.
If you are keep seeing the problem, when it happens, the question is always the same: in the very moment you don't see buildings, do you STILL see BOTH the Addon Manager and the Couatl menus under the Addons menu bar ?
Also, check if you have this file:
%APPDATA%\Virtuali\Couatl.Err
If you have it, send it via PM or email.