Hi Antonio, thanks.
I tried again while monitoring the console log as suggested. Still fails and I'm getting the following error pop up:
PHP Warning: Creating default object from empty value in /srv/www/htdocs/pandora_console/godmode/groups/group_list.php on line 304
Line 304 in that php code is working on the table object:
302: $groups = users_get_groups_tree ($config['id_user'], "AR", true);
304: $table->width = '100%';
As far as I can see thats when it has already tried to create the group and moved on to displaying the table again.