I have the module installed with the latest codemirror 0.66 release and it is enabled in the admin. Wysiwyg-TinyMCE is configured for use in filtered and unfiltered.

When clicking the HTML button the editor window is producing a 500 internal server error.

Is this reliant on anything else other than codemirror or does it have any known conflicts with other modules?

Drupal 6.13
Wysiwyg 6.x-2.1
TinyMCE 3.3.1
Apache 1.3.37
PHP 5.2.8