New Post: Gateway settings being Ignored

Hi, I added a custom gateway and changed the settings in the back office so that it should appear, but nothing. After trying many differing combinations I decided to try removing all other information on other gateways except mine as a test. And it still remains the same at checkout.

I'm now totally confused, It seems to be totally ignoring the settings listed in the documentation under 'Gateways'.

Anybody ?