When clicking the xfce menu plugin in the panel (either launching an app from it or just opening and closing it again by clicking on the desktop or somewhere else), the panel won't hide again when configured to autohide. One has to hover over it with the mouse or click sth. to make it hide again. I have a reasonable recent CVS version of panel and desktop installed (don't know the exact checkout date)
Yeah, I'm not sure it can be helped. This also happens when you use any right-click menu. The panel does not notice the mouse moved outside the panel area, because the gtk menu captures all events. Hmm, perhaps I can watch for the menu to be closed again ...
Ok, this should be fixed now (after the usual delay for anonymous cvs). You need to update xfce4-panel and xfdesktop.