Are you talking about the 'editor.BreakElement' property?
if so, Yes I has bad experiences with them also (I do believe it should be p and not <p>) EG:
editor.BreakElement= "div"
or
editor.BreakElement= "p"
(Unless they have changed the 'editor.BreakElement' property like many others from version 4.0 to 5.0)
I use div for best results
HTH
Wind is your friend