Oct 31, 2015 – Autodesk released a Hotfix for all AutoCAD 2015 based products
The AutoCAD 2015 New Tab Hotfix deals with the issue that cause AutoCAD based 2015 to crash when attempting to open files on a disconnected resource via the New Tab interface.
This hotfix applies to all AutoCAD 2015 based products including AutoCAD Civil 3D 2015 and AutoCAD Map 3D 2015
This hotfix requires you to manually to locate and replace your old acad.exe with the proper 32-bit or 64-bit version that you download.
This hotfix does not appear in the Autodesk Application Manager for Infrastructure Design suites.
The hotfix is available from the 2015 support download pages