Have you determined a maximum number of characters allowed in FCKEditor?
I seem to have hit a wall. It will display the text to be edited, but changes don't get posted back to the server - only the original text gets posted back to the server. I am assuming that the changed text is not copied back to the hidden input field.
This problem only occurs with large amounts of text. Smaller lengths of text work just fine.
This may be a limitation of the editor, of javascript or the browser itself.
I realize this may be more suited for a bug report to the FCKEditor project, but the stack overflow community seems really responsive and willing to help.
Edit: I should clarify what I mean by large. A text field with 60,000 characters is giving us problems.