Yes, it's a bug in FSX, which you might try to fix by doing all of the following:
- Reset your video driver to default
- If that doesn't work, try to delete your FSX.CFG, so a new one will be created with all default settings. Apply only the HIGHMEMFIX = 1 tweak and nothing else, if you use FSX.
- If that doesn't work, be sure you are not running the sim or any of the addons that starts with it in Compatibility mode.
After resetting the FSX.CFG, you must reinstall GSX, otherwise it won't find its own Simobjects, because the FSX.CFG must be edited by the GSX installer. Note that, we cannot guaranteed it will work with FSX SP2, since there are several rendering bugs that simply cannot fix there. If you really want to keep using FSX, at least use the latest version, that is FSX:Steam.