Appcrash acrobat.exe in module acroform.api

Acrobat X keeps crashing when I close the application.

Windows error reporting reports the application which crashed is acrobat.exe and the faulting module is: acroform.api v10.1.1.33. There is also an additional error code: 0a9e.

I'm running Acrobat X on a Windows 2008R2 based Citrix server.

Is there anybody out there who has the same error and knows how to get rid of it?