Set 'Limit the number of responses allowed' to 'Disable' and leave the group 'Limit' set to 0

All groups display as full and are disabled.

Fix:
renderer.php line 99
replace:
if (!empty($option->attributes->disabled) || sizeof($group_members) >= $option->maxanswers) {

with:
if (!empty($option->attributes->disabled) || ($limitanswers && sizeof($group_members) >= $option->maxanswers)) {