If it is due to a rendering issue, you can try starting in safe mode to see if lowering the rendering options will help: You may bring up the option to enter safe mode only if you start the sim with the shift key pressed down.
Otherwise move the preferences folder (found in the Output folder) to the desktop, then restart X‑Plane and default preferences will be restored. If the default preferences do not fix your problem, you can simply replace them with the folder you moved to the desktop and restore your personalized settings.