This site is being deprecated.
Please see the official X‑Plane Support page for help.
I haven't heard about this specific combination either, but the Steam version of X-Plane 10 is a different product than what is sold at X-Plane.com. Issues with it are handled by Aerosoft. Here's a link to their Steam FAQ or you can contact them at aerosoft.de.
This site is no longer being actively maintained.