I have FengOffice installed on two different sites (different hosts) and I have noticed this shared problem. WHen I have an existing note, and I copy some content from elsewhere (a website) and paste the content somewhere within the existing note (say to update the note for instance), and save, the entire note content is overwritten, leaving a blank note. This happens consistently with the two installations and has been an issue starting several versions back. I have 2.3.1 currently installed.