quick fix untill the next release for you
add to functions_global.php
Code:
function stderra($heading = '', $text = '') {
stdmsg($heading, $text, 'error');
stdfoot();
die;
}
change stderr to stderra in takesignup.php and signup.php
the error has todo with stdhead(); been requested twice
ive fixed this in the new version as ive started to use newerr and newmsg which is a completely different setup thus is why i am unable to fix your release completely