In looking at Kathleen's file, I discovered something that may be of use to someone else who runs into a file corruption problem.
Her file did indeed crash 11 build 1210 upon opening for me, as for her - and I'm Mac and she's Windows.
I opened the file in AC 12 (seemed to work OK) and immediately saved it back to 11. The result opened in 11 and allowed me to work through the views and layouts - although there was another crash related to closing elevation windows.
All sent to GS for analysis.
But, clearly the file integrity check that 12 does when opening a file fixed some of the problems - so that's the part I wanted to share as another option over doing a 'forward merge', etc.
Also, I should note that the file seems to work just fine in 12.
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB