No video fields shown when adding Video content type

I can't see any video fields when creating a new "Video". I have investigated the problem down to line 807 in video.module. I've placed the following line directly before this line:

drupal_set_message('video_' . $node->vtype, 'v_form', 'warning');

the result is:

"video_"

It seems $node->vtype is null. Why is this happening? I have uninstalled and reinstalled this module twice. I have also cleared all caches and run update.php. Is video.install forgetting some table entries or something??

Thanks.