draggables not respecting container when containment set

draggables not respecting container when containment set


I'm having a very odd problem when I set the containment option for a
draggable element.
$('.ifc_graph_container').draggable( {
        handle: '.ifc_graph_header',
        containment: '.graphs_tile'
});
When I drag the element, it gets a wildly off inline css top attribute
set, for example. "top:-1770." If I comment out containment, all works
fine (inline top isn't set), but I lose the containment feature.
This wasn't an issue with 1.5b2 but has been with subsequent
releases.
Has anyone else seen this problem?