I have an app that uses a javascript menu with many items, and many of the pages in the app have grids created with Office Web Components (OWC 11). 

In IE6 everything worked just fine, but in IE7 many of the javascript menu items appear behind the grid, making them unavailable to the user. 

At first I thought it was the "windowed" vs. "non-windowed" controls issue (see MS Knowledge Base article ID 177378), but then I realized if that was the problem, it should have occured in IE6 as well. 

Can anyone, particularly anyone from the MS IE team who might happen by, shed some light on what has changed between IE6 and IE7 that might have caused this problem? 

Any assistance will be greatly appreciated as this is a serious issue for a legacy application at a VERY LARGE corporation with 2500+ users that needs to be solved quickly.

 Thanks in advance.