diff --git a/PrefFeedTree.js b/PrefFeedTree.js
index ee3cd152c..27709cdb7 100644
--- a/PrefFeedTree.js
+++ b/PrefFeedTree.js
@@ -2,6 +2,7 @@ dojo.provide("fox.PrefFeedTree");
 dojo.provide("fox.PrefFeedStore");
 
 dojo.require("lib.CheckBoxTree");
+dojo.require("dojo.data.ItemFileWriteStore");
 
 dojo.declare("fox.PrefFeedStore", dojo.data.ItemFileWriteStore, {
 	
diff --git a/prefs.js b/prefs.js
index 5d9107f97..bcfd40603 100644
--- a/prefs.js
+++ b/prefs.js
@@ -1111,7 +1111,7 @@ function init() {
 		dojo.require("dijit.tree.dndSource");
 		dojo.require("dijit.InlineEditBox");
 		dojo.require("dijit.ColorPalette");
-		dojo.require("dijit.ProgressBar");
+		dojo.require("dijit.ProgressBar"); 
 
 		dojo.registerModulePath("lib", "..");
 		dojo.registerModulePath("fox", "../..");
@@ -1121,15 +1121,15 @@ function init() {
 		dojo.require("fox.PrefFilterTree");
 		dojo.require("fox.PrefLabelTree");
 
-		loading_set_progress(50);
+		dojo.addOnLoad(function() {
+			loading_set_progress(50);
 
-		var query = "?op=rpc&subop=sanityCheck";
-
-		new Ajax.Request("backend.php", {
-			parameters: query,
-			onComplete: function(transport) { 
-				backend_sanity_check_callback(transport);
-			} });
+			new Ajax.Request("backend.php", {
+				parameters: {op: "rpc", subop: "sanityCheck"},
+					onComplete: function(transport) { 
+					backend_sanity_check_callback(transport);
+				} });
+		});
 
 	} catch (e) {
 		exception_error("init", e);
diff --git a/tt-rss.js b/tt-rss.js
index 674623112..69cda7e07 100644
--- a/tt-rss.js
+++ b/tt-rss.js
@@ -279,12 +279,10 @@ function init() {
 		if (!genericSanityCheck()) 
 			return;
 
-		var params = "&ua=" + param_escape(navigator.userAgent);
-
 		loading_set_progress(20);
 
 		new Ajax.Request("backend.php",	{
-			parameters: "backend.php?op=rpc&subop=sanityCheck" + params,
+			parameters: {op: "rpc", subop: "sanityCheck"},
 			onComplete: function(transport) {
 					backend_sanity_check_callback(transport);
 				} });