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@Anonymous wrote:

The computers are Mac's:  One computer is running OS X Yosemite version 10.10.5 with ACAD LT 2015 on the latest update. The other computer is running OS X El Capitan v 10.11.15 with ACAD LT 2016 on the latest update. The files are stored on a shared folder on a Synology.

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Autodesk doesn't support the use of NAS devices.  Probably because stuff like this happens.