editing Custom Attributes from edit bar cause error- {"rel":"","name":"Home","cID":"1"}

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Whenever I try and edit the Customer Attributes (under Properties) from the edit bar it produces a weird error message of the form.

{"cID" :"1" }
or
{"rel":"","name":"Home","cID":"1"}


that's it, just a blank page with the cryptic print out. The funny thing it still saves the change. Also it doesn't happen when I edit it from the site map.

Any one come across this before or have any idea what might be causing it?

I thought it might be a jquery conflict as it only happens on the page and not in the dashboard..

cheers!