I’m a thinking something squiffy is up with either another plugin or theme or browser cache on that one then. It would be using scripting for the drag and drop so perhaps that’s what is sticking.
Did you try using firebug or even the default BuddyPress 1.5 theme with no other plugins and browser cache cleared? Just trying to level the playing field.
That said if it works now you probably can’t test but worth noting for future maybe.