Ah, it was the last image that you posted, showing the OPC's console logs when you're trying to change payment/shipping options.

I didn't look back through your postings to see what template you're using, but whatever it is the template file /jscript/jscript_framework.php is not being loaded (that is where the zcJS function is defined). That zcJS jQuery function is the method that OPC uses to do its AJAX "magic".

What version of Zen Cart are you using (again, being lazy)?