Opening PDFs in Outlook 2013 gives EPDM error

The error is 'No database is connected to this view'. It happens when a PDF is double clicked in outlook. All other ways of accessing any pdf are fine. This is happening on two PCs at this time out of 30+ users of EPDM. Other users are on Office 2013 as well with no issues.

EPDM 2014 SP5

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