Hi Tony,
To investigate the problem, we will need your project suite along with failed tests execution results. Zip the folder containing your project suite. Then, submit a request via our Contact Support form and attach the archive to the request. Point out the problematic object.
Also, in the request, answer the following questions:
1. Can the problem be reproduced on some public site? If it cannot, we will need you to give us access to your application or a sample application on which the problem can be reproduced.
2. Let me know the versions of the browser, OS and Silverlight framework on which the problem can be reproduced.