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A blank page on userinfo.php probably means there's a problem with the search function of one of the installed modules.
If you want to keep using the module you can try deactivating the search function in xoops_version.php of the module.
find
$modversion['hasSearch'] = 1;
change to
$modversion['hasSearch'] = 0;
You'll probably need to updated the module for the change to take effect.
Or you can investigate the search function, work out what's wrong with it - but there's no general solution for that which I could post here