Well, that wasn't the problem. Planner has the filters greyed out in Preferences so I can't create a plan. The Maxim button to import the filters does nothing. I can find only one plan that Planner will import, my default flats files and it immediately launches Plan Checker which fails it because no times are included. Dragging plans to Checker launches something that immediately closes. This is a new Win 11 pc with latest versions of ACP and Scheduler. I have been fighting an ASA telescope driver which has finally been fixed.

Is this some sort of compatibility problem between Maxim 7 and/or Win 11?