Text Area Gets Wonky

Just installed this & it seems to work, but I noticed that the text area for the editor stretches after loading. It appears correctly for a split second & then the right/left borders vanish and it widens.

Compatibility mode doesn't fix this.

I'm using IE9 in the screenshot, but this happens in Chrome as well.

(Current WPMU, Current Network Theme, Current plugin version)

Chrome is showing the following errors in the javascript counsel

1.) Resource interpreted as Stylesheet but transferred with MIME type text/html. wordpress.css

2.) Failed to load resource: the server responded with a status of 404 (Not Found)
wp-includes/js/tinymce/plugins/wordpress/wordpress.css: -1

~ Corey