Question: Can't send to MathMLViewer

I recently installed Maple 11 and have just been looking at the Maplet Builder.  I'm having trouble with MathMLViewer.  In the simplest case, I created a maplet with 2 elements, a MathMLViewer and a button.  I set clickButton1 to evaluate the expression MathML[Export](1) with MathMLViewer1 as the target.  Then I ran the maplet and clicked the button, expecting to see 1 in the viewer.  Instead an error box titled Dispatch popped up saying, invalid input: XMLTools:-NSXML:-Parser:-processOutputString uses a 1st argument, str, which is missing. 

This has happened every time I've tried to export to MathMLViewer.  What am I doing wrong?

Thanks, Bob Baker



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