Force user to select carrier

[nickon]

Hi, I have a strange problem that keep comming up from time to time. I have used shiptopay and/or a tutorial from nemo to show selected payment methods depending on the carrier the user selects. As I already said this does happen radomnly and I can't blame shiptopay because this also happened with hardcoding a similar solution based on a nemo tutorial. I have to select an other carrier then select the old carirer (or refresh the page) for this to be fixed. So the question is can I have no default carrier or force the user to select one. Or make the page refresh automaticaly. Thoughts?