diff --git a/core/modules/pluginswitcher.js b/core/modules/pluginswitcher.js
index ab82be933..395dc8b20 100644
--- a/core/modules/pluginswitcher.js
+++ b/core/modules/pluginswitcher.js
@@ -60,6 +60,8 @@ PluginSwitcher.prototype.switchPlugins = function() {
 			}
 		};
 	accumulatePlugin(selectedPluginTitle);
+	// Read the plugin info for the incoming plugins
+	var changes = $tw.wiki.readPluginInfo(plugins);
 	// Unregister any existing theme tiddlers
 	var unregisteredTiddlers = $tw.wiki.unregisterPluginTiddlers(this.pluginType);
 	// Register any new theme tiddlers
diff --git a/core/wiki/config/RegisterPluginTypes.multids b/core/wiki/config/RegisterPluginTypes.multids
index d2113728b..f0e52acd5 100644
--- a/core/wiki/config/RegisterPluginTypes.multids
+++ b/core/wiki/config/RegisterPluginTypes.multids
@@ -1,7 +1,7 @@
 title: $:/config/RegisterPluginType/
 
 plugin: yes
-theme: yes
-language: yes
+theme: no
+language: no
 info: no
 import: no