I've found that the onEnter action is ignored if the event coincides with an onExit on another object.

In my example, i've made two intersecting spheres. The mouse-over status is displayed in two form elements for each of the spheres. It all works fine as long as the mouse travels to an empty area before entering the other object, but if the mouse travels from one object to the other without going over empty space in between, the onEnter action for the 2nd object is ignored. Here is the example:
http://24.130.84.204/todd/spheres.html

Hi Todd,

Thank you for the bug report. I have pasted this along to QA to test.

Cheers, Andrew