“Yes, the issue here is residual styling from the theme’s #access nav element. What you’ll want to do is use Manual Integration to move the menu outside of the #access element so that the theme’s styles don’t interfere with UberMenu.
I also recommend switching back to a standard skin while you’re getting things integrated.”
I’ll try it now on my own.
@anna: Is it possible to u code the integration of ubermenu to your theme with this information?