I have the same issue with Version 2.8. When I want to edit a long page (more than 3000 words), the textbox for the content will not appear.
Thank you for the tip with phpmyadmin. It works, but it also means that you have to edit the page with phpmyadmin. In this particular case editing is envisaged (it is not a blog post, but a page). This, of course, is only possible if you, as an editor, have access to the database with phpmyadmin. In my case that is no problem, but in an environment, where editors should access the blog only through wordpress, this will be a problem.
Would be nice, if somebody could sort this out.
