I purchased SkyMaxx Pro and SWC several days ago. I have X-Plane 11.50 on an iMac with OS Catalina. When I start a new flight, I get a solid blue screen, with nothing on it, except the menu bars at the top left and right. I have turned Metal off. 
	I purchased Maxx FX, also, and it works well.
 
	 
 
	Thanks for any assistance.