Blank White Screen of Death - licence/validation?

Hi,

I'm having difficulty getting Postnote to show anything but a blank white screen.

When I go into the template manager and change the default to any of the other templates, they show.

I have enabled the mod_gk_register and all my Directory permissions are writable.

Another joomla site of mine is running on the same Linode VPS server with no issues, it's two years old. I've tried Postnote on another server and iot works flawlessly.

Could this be a license/validation issue?

An hour later - I've now validated the site but I'm getting an HTTP 500 Internal Server error.

www.anzukteachers.com

Help would be appreciated.