When clicking on view project cases I get error - An Illiegal choice has been detected.

Hi-
I have a problem... when I try to view project cases... like at http://mancanthink.com/casetracker?keys=&pid=702

by clicking on the view project cases I get this error. And the drop down box titled project is higlighted in red.

But then if I click on the my cases tab, and back to the cases tab, I get no error and my page url is http://mancanthink.com/casetracker .

Thanks for any help on this great module...