[Chameleon] BoundingBoxPopup error

[Tweedy, Scott]

I'm getting an error when I'm trying to use the BoundingBoxPopup widget.
The widget seems to open fine when In click on its button, but in the the
JavaScript Console I get the following error:

Error: uncaught exception: Permission denied to get property
Window.getMapExtents

When I enter coordinates in any of the boxes and click Zoom, nothing happens
and I get this error in the JavaScript Console:

Error: uncaught exception: Permission denied to get property
Window.applyBoundingBox

Any ideas on why this might happen?

Thanks in advance,
st