Thank you - you may have given me a helpful hint !

I am coming to the worksheet from another worksheet and I think that is what defaults to the upper frozen pane.

You seem to have your active cell already in the lower pane, so SCROLLROW becomes active in the lower pane.

So I am going to try first selecting a cell in the lower pane, THEN activating SCROLLROW. I will let you know how I get on . . .