I'm having the same problem in Mozilla and Netscape and Opera(occasionally). 
 http://www.jamiefergusson.co.uk/demos/xp 
On the first mouseover of the start button the menu is displayed in the bottom left corner and not above the start button, occasionally it was mis-aligned in IE that seems to ...
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- Tue May 04, 2004 4:37 pm
 - Forum: Help & Support for DHTML Menu Version 5+
 - Topic: Firefox Menus - Wrong Location on First Mouseover
 - Replies: 9
 - Views: 7061