>Thanks- that worked. I'm still perplexed as to why this should happen. Is it indeed because the form and the MessageBox are both modal? If so, why on earth should that affect the _SCREEN.Closable setting? How is it being affected? I'd love to know why this happens. But I'm also more than a little happy to have a workaround, so I'll count my blessings.
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>Thanks again.
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>Henry

I have no idea why the two are tied together, but that was something I stumbled upon that works.