A new public patch was released.

Prior to this patch, if the Silverlight 3.0 plug-in was
installed on the QuickTest computer, then QuickTest
Silverlight Add-in was unable to identify an application
as a Silverlight 2.0 application.

Note: The Silverlight Add-in does not officially support
Silverlight 3.0 applications. However, although
Silverlight 3.0 is officially unsupported, it is expected
that some of the functionality supported for Silverlight
2.0 may also work in Silverlight 3.0.

Additional information about this patch and the patch download are available at the HP Software Support Online website:

Official support for Slv 3.0 is planned to be released in the next few months that will add support for new Slv 3.0 controls.