I previously had 10.5 and opened up an ArcGIS 10.2 versions MXD. This week, I upgraded to 10.6 and tried to open the MXD from that same 10.2. That MXD would not open. All it would do is "not responding". I copied, renamed it and even re-downloaded it from the email it was sent from. Nothing. Corrupted?
I opened up older mxd's of mine when I had 10.1. Another Mapper used different versions 10.5 and 10.2, could not open that one either. But, could open others.
Are there any solutions?