There is a bug in the new permissions code that prevents saving
group permissions. You'll be taken to a Not Found page instead. The
fix is easy, but at the moment can't be pushed up due to some
complex changes with the move to Container 2.0.
To fix locally, edit the
/framework/modules/user/controllers/usersController.php file and
insert at line 1087
'loc'=>$loc,
so that
'perms'=>$perms, 'title'=>($modulename !=
'navigationController' || ($modulename == 'navigationController'
&& !empty($loc->src))) ? $mod->name().'
'.($modulename != 'containermodule' ? gt('module') : '').' ' :
gt('Page'),
becomes
'perms'=>$perms, 'loc'=>$loc, 'title'=>($modulename !=
'navigationController' || ($modulename == 'navigationController'
&& !empty($loc->src))) ? $mod->name().'
'.($modulename != 'containermodule' ? gt('module') : '').' ' :
gt('Page'),