ahhh, you have ULTIMATE SEO URLs. Not once have you mentioned this. Never leave this information out when troubleshooting any module. Let alone the fact USU is very buggy to begin with.
I will add this information to the readme.txt:
in classes/seo.url.php on ln 141, change to:
PHP Code:
if ( ($this->attributes['SEO_ENABLED'] == 'false') || (preg_match('/(.+)\.(html?|xml|css|js|png|jpe?g|gif|bmp|tiff?|ico|gz|zip|rar)$/i', $page)) or $page == 'checkout' ) {
That will disable it for 'checkout' so that it can use parameters in the PHP url.
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