This is not a bglmanx.dll "bug", if anything, it's an FSX bug that sometimes happens randomly with every module from any publisher.
Check all the following:
- You don't have any "compatibility mode" for FSX.EXE enabled. Right-click on FSX.EXE, select "Properties", select "Compatibility" and be sure nothing is checked on that page, which is how FSX defaults to.
- Try a Windows reboot. Launch FSX again, ALLOW the module to run, even if FSX says it might cause problems, and even if FSX crashes. Try a couple of times, and if it doesn't work, reboot Windows again and try again.