jQuery last draggable does not fire

my site has a number of draggable items like this: $(".flash_drag").draggable({ opacity: 0.7, revert: true });

As well as an area on where to drop them, like this $(".flash_target").droppable({...

When they are dropped I remove them, which works fine.

However, when only one draggable item remains, all of a sudden the actions under .droppable are not performed anymore and nothing happens.

Has anyone every experienced开发者_Python百科 something like this before? (I am using jQuery UI latest)