I'm running WWT Equinox Fall Beta under XP SP3 with Duo 1.83 GHz, Nvidia GO 7400 video
Problems:
1) Left over from Spring Beta -- Cannot advance Context menu panes -- momentarily advances, then reverts. When the context menu is expanded to multi-rows, the same behavior. And in this case, the entire multi-row pane blinks at a 1 sec. rep. rate. This trigger may be what makes the single row pane to revert -- sometimes see a slight (~1/2 s) delay before revert.
2) When tabs are in Auto-hide, they hide even when the cursor tip is along the lower margin of the pane, making it difficult to select items along the border.
3). Panoramas just don't work, either from the Explore>Panorama>Item pane, or from the Context pane when you select Panoramas, Item (Spirit, Opportunity, ...)