The Aerosoft CRJ is not flyable for many users after SU5. The Aerosoft Devs have identified all issues and notified Asobo about what fixes are needed in the core sim for the CRJ to fly again, but was not included in the latest fix.
Like many simmers, I believe the CRJ is the best quality jetairliner so far, and a fix is needed asap.
Please upvote here if you feel the same: Make Aerosoft CRJ flyable again