XL2000: Creating scenario crashes Excel

In an experiment I used Scenarios.Add (with range names and values created by the above code) to create a scenario in a new, otherwise unused worksheet. I was able to get to the scenario (via Tools, Scenarios...) without crashing. So clearly there is something about the Consolidation sheet that does not like having a scenario created. It's not the code, it's the sheet.

Edit: So I tried a copy & paste values of the sheet to a new workbook. Ran the above code (less the Scenario.Delete) and it also crashes on Tools, Scenarios.

Ugh!

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