Among the utter failures of the new patch is a glitch where entering the cockpit of an aircraft converted from FSX will (most likely) immediately crash you to desktop.
I have about 10 aircraft that I have converted and flown multiple times. All of them worked ‘fine’ - still subject to the known limitations of conversions, but perfectly usable for my purposes - prior to the patch today. Now, I can only fly one of them without crashing.