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If you’re trying to edit a template the following error message appears: 

„Unable to cast COM object of type ‚Microsoft.Office.Interop.Word.ApplicationClass‘ to interface type ‚Microsoft.Office.Interop.Word._Application‘. This operation failed because the QueryInterface call on the COM component for the interface with IID ‚{00020970-0000-0000-C000-000000000046}‘ failed due to the following error: The RPC server is unavailable. (Exception from HRESULT: 0x800706BA).“

Reason: 

The reason of this error is unknown yet

Workaround:

To work around this problem you have to change the loadbehavior from 3 to 9. This chnage will be made in the registry . 
Warning: Make a backup of your registry before you are making any changes. You can find a tutorial here.

32 bit: 

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Word\Addins\ACT7.OfficeAddIn
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Word\Addins\ActOffice2007Addin.Connect
  • HKEY_CURRENT_USER\Software\Microsoft\Office\Word\Addins\ACT7.OfficeAddIn
  • HKEY_CURRENT_USER\Software\Microsoft\Office\Word\Addins\ActOffice2007Addin.Connect

 

64 bit: 

  • HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\Word\Addins\ACT7.OfficeAddIn
  • HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\Word\Addins\ActOffice2007Addin.Connect
  • HKEY_CURRENT_USER\Software\Microsoft\Office\Word\Addins\ACT7.OfficeAddIn
  • HKEY_CURRENT_USER\Software\Microsoft\Office\Word\Addins\ActOffice2007Addin.Connect 

 

You have to change this value to 9.