I have a case manager who has been having trouble merging documents unless Word is open. This is Word 2010 on a Windows 7 PC. Once she enters the information in our case management software and clicks OK, it should open Word and merge a letter. The merge documents are located on our network. It will not work unless Word is open already. If it is not, Word will open, but she will receive the following error:

The document was not found.
X:\NetworkPath\DocumentName.docx
This workstation may not be mapped properly to the network or the document may have been moved or deleted.


It works fine on our XP Pro computers using Word 2007 whether Word is already open or not. What would be causing this?

I should add that I tried it on our only other Windows 7 PC with the same results.