To exit from the loading loop:
- Close the toolbar menu first
- Choose Restart from the small Couatl icon in the Traybar notification area.
- Wait about 10 seconds before opening the menu again so, don't start immediately.
When you open the menu again, allow it to load, don't open or close it quickly because, if you do that while is still loading (because my 10 seconds might be more on your system), you will make it stuck doing that.
In general, you can reduce A LOT the chance for this to be happening in the first place, if you use the menu as suggested in the manual, that is:
- Open it with the mouse on the toolbar only when you first start GSX, and then close and open it only with the Hotkey.
- Close it from the toolbar only when you are done with GSX, or before ending a flight. This will stop MSFS trying to opening it again on the next start, which increase the chance for the menu to be stuck