I am having a problem with a fairly complex layout using a window, tabs, tabs within tabs, panels, forms, grids, etc. Everything renders and displays correctly in FF2 but in IE7, the window renders and displays correctly only the first time it is displayed. If the user clicks through the some of the child tabs within the parent tabs and closes (hides) the window then opens it again, several of the controls on the tabs are missing or in the wrong spot. I am using the deferredRender : false and layoutOnTabChange : true configuration settings on the tabs but no change. Could this have something to do with state management? I have to give a demo of the application soon and I have run out of things to try. Any help would be appreciated.