When you try to modify certain elements in your project, Revit gives the message "Display Error -An error has occurred while drawing the contents of this window. This window shall be closed." or "An unrecoverable error has occurred. The program will now be terminated."
You notice that the problem walls crash when the detail level is set to Fine or Medium. It doesn't crash when set to Coarse.
There has been a change request logged on this issue and I have added this case to the change request.
The only workaround I have found for this issue at this point is the one you found to change the Detail Level to Coarse. This issue should be addressed in a future update.