some minor cleanup of unreported (and as yet undiscovered) issues with permissions toggling. No smoking guns and no obvious issues discovered here. Repeated and tried to duplicate zottell's issue as described without seeing any obvious problems.

mod/settings.php

@@ -337,6 +337,7 @@ function settings_post(&$a) {
 				intval(local_user()),
 				intval(ABOOK_FLAG_SELF)
 			);
+			set_pconfig(local_user(),'system','autoperms',(($role_permissions['perms_auto']) ? intval($role_permissions['perms_accept']) : 0));
 
 			foreach($role_permissions as $p => $v) {
 				if(strpos($p,'channel_') !== false) {