This seems like an issue others must have, so I apologize if this has been covered somewhere already... I noticed that when deleting a flash object from design mode in Firefox that it only removes the "embed" portion and not the "object". So it appears to have removed the SWF, but in IE the object code still renders. In Firefox there seems to be no way to remove a SWF from design mode? I was able to test this in your "Editor/Save in Database" example page.
Cheers,
CG
Cheers,
CG