sortable positioning incorrect, in a left float parent, (FF3 on OSX), UI 1.6x

sortable positioning incorrect, in a left float parent, (FF3 on OSX), UI 1.6x


First of all, thanks for a wonderful sortable library. I'm converting
a project from Prototype/Scriptaculous, and am finding the
implementation a lot cleaner, and the performance much better.
I have a sortable div with css: "float:left;" that is floating about
100px from the left (next to another left floating div). In FF3.0.4 on
OSX 10.5, when I click down and then move (change position) on a
sortable item, the item position is set as if the sortable div was at
the upper left of the viewport. That is, the sortable item appears
about 100px to the left of the cursor and where it should be.
This behavior is not exhibited on Safari 3.1.2 on OSX 10.5, nor does
it show up with UI 1.5.2 stable. It does happen with UI 1.6rc1 and UI
1.6rc2.
Thanks,
Mark Yoon
yoon@northwestern.edu