Go to 280slides.com/Editor, dismiss the welcome box, and attempt to drag one of the text boxes around. It will not work (or print any errors in the JS console). Do the same thing on Safari 4 Beta (or earlier), and you will be able to drag the box around. The behavior is worse with our new 0.7 beta code, but since it's not running anywhere yet, I won't bother you with that now.
*** This bug has been marked as a duplicate of 24743 ***