When viewing a page containing a set of tabbed panes (such as the forum post creation page or the edit profile page), the height of the rendered page can grow larger than necessary in IE when you select a short tab after a tall tab.
This is caused by the mechanism used to hide inactive tabs. Even though IE makes inactive tabs and moves them far off-screen to the left, IE still provides vertical space for these hidden areas.
Community Server 2007.1 included an update to move inactive tabs far above the top of the screen. This allows IE to determine the height of the page based solely on its visible contents.