Test Studio's built in Handle Logon dialog is not working in Test Studio 2012.2.1527. Test Studio seems to not see the dialog. All you get is an error that it timed out waiting for the dialog to be handled. This only happens in Firefox and Chrome. Logon Handler works in IE and Safari.\

To Repro:

In the first step I have a navigate step to the application URL. Then the second step is a logon step where I enter UserName and Password. 
The dialog is being displayed, but no text is being input.