The Aerosoft CRJ is internally supported by GSX, so there's no need to use a custom configuration for it. If you are using a custom configuration for it, remove it, so GSX will use its internal one, which surely works.
You can check which configuration GSX is using by opening the airplane configuration editor. When the GSX internal configuration is used, it should say "Internal GSX Database" under the "Aircraft data used by GSX" heading.
I tried it now, and it works correctly, see the attached screenshots.