My guess your issue with invite system is wrong mysql version.
V5 will not work under mysql 5.7 PERIOD.
bravolist aint an official support forum anyway for u-232
goto
http://forum-u-232.servebeer.com/index.php signup/login and post there. Those people know more about u-232 then random people at bvlist..
But be ready to provide basic site info like php version, mysql version, os version if want support
if your invite page is trying to use template 9 or some crap, it aint official in that case stop trolling starting shit about non official versions :D