Browsers scrollbars do not work with adminmenu

First of all: thanks for all the time this nice module saves me every day!

I've a problem with scrollbars in my browsers though: when using adminmenu they do not work anymore. They are just stuck to the top, and draggin them with the mouse has no effect...to scroll my pages i can only use the scrollwheel of my mouse, but that's not confortable feeling sometimes, expecially in long pages.

When visiting the site as anonymous (thus without access to the adminmenu) this does not happen, and not happens neither if i completely disable the menu of course.

Ah, tryed both with the serbinski and with the small menus, just in case was some css problem, but nope.

Drupal 4.7.2, Mac Os 10.3.9, tryed both Safari and Firefox 1.5

Thanks for considering