I am stuck with asp.net post issue with last 2 weeks.
Scenario:
My application page has 3 controls. A WYSIWYG editor (Free Textbox), a text
Have you looked at whats being posted back?
Try something like Fiddler2 to view the postback.
You may find that something is being truncated at the browser.
The RichText area may also be limited by the number of chars it will post back.