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
