5
the form in the yoursiteurl/register.php file has a size='0' maxlength='0' .. it causes the problem that users cannot input a name in there. i would say modify the field.. the register form is in XooPS/include/registerform.php ..but..
i also see that you are also using ipboard.. i dont have any experience with that module and if there is supposed to be certain modifications to register.php specific to the XOOPS version you are using. so i dont think i can really suggest any changes to register.php
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