Just sharing an experience here. RF 3.3.3.
A client was copying and pasting a little text from a docx into a rich:editor. About 100 chars. But it was actually a 18,000 (that´s right, 18K) chars XML with plenty of an insane formatting code, so when we were trying to save the string into the DB... well, guess what :-(
So be careful about copy and paste with docx.
Best regards
Leo K.