I am new to Presta Shop and trying to create a custom theme. I have read about the documented way to do this by extending the current module css/template files where necessary here: http://doc.prestashop.com/display/PS15/Overriding+default+behaviors

It all seems straight forward. I have over rode the templates and CSS for 2 modules so far with ease but on my 3rd attempt I am encountering some issues.