The precondition on the request for the URL /prototype/wp-admin/media-upload.php evaluated to false.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
I get the above error message whenever I try to insert an image into my page/post. Everything worked fine for months since until about 3 weeks ago. I've tried everything I could think of to no avail.
I have other sites running on 3.2.1 with no image upload/insertion issues.