Hey, same Issue here.
I am using MSFS from Steam and BN2-Islander and CRJ500/700 are causing CTDs.
I installed the game fully new, without any mods or content from marketplace (including WU etc) and the SIM runs fine. Downloading either CRJ or BN causes the SIM Crashing in World Map selection the plane or at least when u click Flying. You can also select the plane and look at in in your Profil->Hanger and the Sim will Crash.
After the first download and the first crash running the SIM, the sim is CTD´ing everytime at loading and doesn’t even will start in Menu anymore.
Only Solution is to delete content folder under X:path\msfs\Official\Steam"STOREPLANE". The Sim will start up and run normally again. This CTD is reproduceable for both aircraft for me.
With BN just hitting the MSFS ingame Store just yesterday. the Problem with CRJ existing after the last crj Patch and with lastest SU4. There is a huge thread of people in Aerosoft Forum experience the same issue. (thread got closed because mods wont move it to right forum section, and asking to reopen tickets…) One response was a Guy testing CRJ download from AS itself and not from MSFS ingame worked, because aircraft was installed to community folder and not in official.
Aerosoft Forum CRJ CTD
I hope it will be fixed soon.
Greetings