Freshly installed ArcGIS desktop v10.4 over v10.3 ArcMap crashes (sometimes) when opening a 10.3 MXD. I updated 2 machines from 10.3 to 10.4. One machine is crashing when trying to open the MXD's we have been using without problems up to now. The thing is, it only crashes when opening some of the MXD's, not all.
On the 2nd machine...no problems at all. These machines are identical.