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The following page is based on the "Drag & Drop: Reordering a List" example. With the lists converted to nested divs and drag "handles" added
http://mullins.microbiol.washington.edu/transfer/testYUI_DD.html
I haven't had a chance to test this in Windows yet.

Expected behavior (seen in Safari):
Mouse-down on a widget's header
Drag widget to new location in either "bucket" column:
Other widgets open up space as widget passes between them.
Mouse-up to release widget in new location.

When the page is rendered in Firefox drag drop functions as follows.
Mouse-down on a widget's header
Drag widget to new location in either "bucket" column:
When element drags over first widget onDragOver fires
The mouse seems to loose the moving widget.
Mouse-up regains full control of the widget.
Mouse click will then release the widget in a new position.

This seems to be caused by having the "draggable" widgets' style.overflow set to auto (scroll will also cause the problem).
Is this a Firefox problem, a YUI bug, or a feature?

http://ubik.mullins.microbiol.washington.edu/transfer/testYUI_DD.html

Sorry about that I forgot that the shorter alias doesn't work outside of our network

Perfect sense; thanks!

FF prompted me to install 3.6 this morning, and the upgrade fixes the issue. However from what you're saying it sounds like I should still add a second element to handle overflow so this doesn't come back and bite me in the rear down the road