Trouble submitting: Textarea size limits?

Hi, this seems to be a really nice editor - I'm thorougly impressed so far!

I've got this weird problem, though. To help me test configuring the editor, I've made this small CGI script that prints the form input to screen. It works OK when submitting a few lines of content, but when the editor contains lots of text and I click the submit button, nothing happens. It seems like the button doesn't trigger any action at all.

Is this due to some limitation in the textarea/Iframe? Is there a known limit to the size/length of the content that can be submitted with the editor?

I use IE6.0.2800.1106.

I would really appreciate some help here, ideas or clever thoughts