After applying windows update KB3008923, dialogArguments are 'undefined' when displaying over an existing modal. For example, if you load a page with window.ShowModalDialog alone, the window.dialogArguments object works fine. But if then call ShowModalDialog again from that modal window, the top-most window's dialogArguments are 'undefined'.
This all started after applying this windows update, and this logic is used in several places in our customer's website. So obviously it is critical that it gets resolved, either by having the bug fixed, or a possible work-around.
Any ideas? Is there a way to submit this bug to Microsoft?