Hi, Carol,
Was ChkSys run from her w/s? Drives changing ... did someone plug an external device into her w/s while she was away or some new card in her w/s? That can sometimes cause issues on occasion if the drive letters used are closer to A.
You haven't said if her shortcuts she is running AJ and AP from has the same Target paths as the other w/s's are using.
It does sound like they might have an old installation on their system. JobCost 9.2A uses the Softrak\JobCost\JobCost.exe. You could do a search on her w/s and the server for AJWIN.exe. They should have only one (current) install of Adagio modules on their system.
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Regards,
Softrak Tech Support