I've never developed anything, but have used every sim since MSFS95 and a whole bunch of add ons, apps, mods etc. I also own the Aviator Edition. 
	 
	I've done a little more testing. All at YSSY Flytampa to stay consistent.  
	 
	I tried the new A359 ULR from Inibuilds and I re tried the A333. Both loaded in fine if I closed GSX before attempting anything. 
	 
	Volenta - no crash, no tracking without FSUICP
 
	Navigraph hub/simlink - no crash
 
	A Pilots Life 2 - Opens but doesn't speak to the sim as it requires FSUICP
 
	BeyondATC - The app opened, but couldn't find a connection to the PC
 
	GSX - If allowed to auto start, causes CTD when attempting to start a flight. If GSX closed prior to starting a flight and then manually opened, GSX won't open
 
	Active Sky - CTD
 
	Simapp pro (winwing) - works, no crash
 
	I then did the same with the Cessna Skycourier. When I attempted to open BeyondATC, it attempted to load into the flight and then CTD.
 
	All I'm saying is, if CTDs are still happening, even after FSUICP is removed, I think we can rule it out and more then likely Simconnect is the issue.