User blog comment:Sarah Manley/New Editor Scheduled for Sitewide Release/@comment-189012-20110911041615/@comment-3388044-20110911070953

 Subtank : If you never use visual mode, have you disabled it in your preferences by un ticking  Enable visual editor (where available)?

If you do not use the visual mode, and that box in preferences is not ticked, those errors rarely if ever happen. It was the same with the old RTE. Give it a try!