Money Order/Checks don't show on one page checkout in magento?

I enabled Money Order / Checks in my magento 1.3.2.3 but it doesn't show in the one page checkout, I can't understand, Enable in the backend should be enough, right?

Ok given the comments I'm going to give you as much details as I can.

• Cache is disabled
• When I enabled another Payment Method, and clic开发者_StackOverflowk "Return, then Next" I can see the new payment method showed
• All countries is selected
• The Default Main Configuration is used over every Stores and Views

My guess that you are using theme not in 'default' scope and module installs its forms and layouts into /app/design/frontend/default/default