Link that triggers ScrollTo event becomes unclickable

Link that triggers ScrollTo event becomes unclickable

I realize that's a terrible post title!

The site I'm developing uses the ScrollTo functionality (Ariel Flesler) to present a number of sections, all accessible by the main menu which gives that lovely scroll when the items are clicked. I've noticed an issue, however:

If the user manually scrolls the page after clicking one of the main menu items, that particular menu item seems to become inactive. The other menu items continue to function, but the one that triggered the last scroll event remains useless until another menu item is clicked. At that point, the inactivity switches to the most recently clicked menu item, and the originally-clicked menu item regains its functionality.

Any ideas would be greatly appreciated!