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Unable to get property 'length' of undefined or null reference

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Not sure if this is an issue with me or not.

Been playing with LobsterPot PivotViewer, for a few days now. Using MVC 4.

When I click on an image, it zooms in. Click on it again, it zooms out, then when I move the mouse, the hover functions excepts with "Unable to get property 'length' of undefined or null reference."

As far as code goes,
       $('#pivotviewer').PivotViewer({
           Loader: new PivotViewer.Models.Loaders.CXMLLoader(cxml)
       });
where cxml is a string containing a reference to a cxml file that works fine with the Silverlight control.

See attachment.

This is frustrating.

I can't get it to fail on the example on the site.

The only thing I believe I have different is my project is using
jQuery 1.8.2
and
jQuery ui 1.9.2

Update:
I've removed jquery 1.82 and JQuery ui 1.9.2 and used the files in the sample code and it still fails, even if I copy and paste the markup from the sample code and use the js files from the sample.

so it isn't working for me under MVC.

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