A recent Microsoft security update (KB2846071) is causing some web applications to display unexpected dialogs that can’t be handled when running test lists. We’ve verified that the Test List settings are set to UnexpectedDialogAction-Handle and Continue, but the application just hangs when it reaches the dialog. To reproduce:

•	On a machine running IE 9, execute a logout sequence
•	The test list completes successfully
•	Then install the security update KB2846071 (the update is specific to your Windows version)
•	Then run the test list again 
•	This time the test hangs indefinitely at the "Are you sure you want to leave this page”  dialog

The issue is repeatable any time you run the test list. It doesnt matter when the steps are recorded or when the test list was created. Rerecording the steps after the update does not help.