RTD.RefreshData crashes when invoked from modal form

[a.collister]

I have created a very simple modal form with two buttons: one just closes the form, and the other calls Application.RTD.RefreshData. In Excel 2003 this all works just fine, but in Excel 2010 the Application.RTD.RefreshData crashes with

Run-time error '1004': Application-defined or object-defined error

If I create the form as modeless everything works fine in both Excel 2003 and Excel 2010.

For what it's worth, this is all the code behind the form:

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And I invoke the form using this code in my sheet:

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Is this a known issue with Excel 2010, or am I really not allowed to call Application.RTD.RefreshData from a modal form?

EDIT:
I should add that as far as I can tell I have no RTD servers in the Excel session.

EDIT2:
This workbook demonstrates the problem. Would be very grateful if anyone could confirm whether they see the same issue, and in which version of Excel...
RTD simplest.xls

[jaslake]

Hi a.collister

Welcome to the Forum!!

Code does not error in Excel 2003 or Excel 2007
Run Time Error in Excel 2010...no clue why...