well, i have it in the project i'm working on right now, but it happens in the online demo as well.
to reproduce it I do this:
select a photo
press your mouse button
start dragging
while dragging, press delete
the image is deleted
now release your mouse button
in my case, i still see the drag cursor and it doens't go back back to normal.
I use FF 3.6.3 on a mac with flash version 10,1,52,15