problem with nice menus (dev) using superfish with hoverIntent

I have a nice menu with hoverIntent in superfish that works as expected in every theme I've tried except Acquia Marina and its derivatives. The timeout delay works in all cases, but the mouseover sensitivity configuration parameter seems to make no difference in Acquia Marina - it behaves as CSS (instant response on
mouseover)

Any idea why that might be?

Thanks,
Paulu N.