Flush router cache when saving Twitter admin settings: adding/removing keys can enable/disable some actions. This avoids having users' Twitter settings unreachable after adding your keys to an installation with TwitterBridge on but not pre-configured.

plugins/TwitterBridge/twitteradminpanel.php

@@ -133,6 +133,11 @@ class TwitteradminpanelAction extends AdminPanelAction
 
         $config->query('COMMIT');
 
+        // Flush the router cache: we may have enabled/disabled bridging,
+        // which will add or remove some actions.
+        $cache = Cache::instance();
+        $cache->delete(Router::cacheKey());
+
         return;
     }