TinyMCE pPoblem

I’ve searched far and wide for a fix for this, but haven’t been able to find any real answers.

The problem is that “some” of the functions in TinyMCE fail to work, and I get the following (example) error:

You don’t have permission to access /wp-includes/js/tinymce/plugins/wpeditimage/editimage.html on this server.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

Any assistance that can be provided would be greatly appreciated…