Adobe Reader X – An internal error occurred.
We had Adobe Reader X on a Windows Server 2012 Terminal server all of a sudden coming up with ‘An internal error occurred.’ After Some research Found that Disabling the Adobe Reader X sandbox protection resolved the error. Here is the registry fix to make the changes. Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Acrobat Reader\11.0\FeatureLockDown] “bProtectedMode”=dword:00000000