diff --git a/chrome/content/zotero/browser.js b/chrome/content/zotero/browser.js
index 60502e9248..0c301991d3 100644
--- a/chrome/content/zotero/browser.js
+++ b/chrome/content/zotero/browser.js
@@ -294,7 +294,7 @@ var Zotero_Browser = new function() {
 	 * object, and updates the status of the capture icon
 	 */
 	var contentLoad = Zotero.Promise.coroutine(function* (event) {
-		if (Zotero.Schema.schemaUpdatePromise.isPending()) {
+		if (Zotero.Schema && Zotero.Schema.schemaUpdatePromise.isPending()) {
 			yield Zotero.Schema.schemaUpdatePromise;
 		}
 		
@@ -448,7 +448,7 @@ var Zotero_Browser = new function() {
 	 * thereof of the current page
 	 */
 	this.updateStatus = Zotero.Promise.coroutine(function* () {
-		if (Zotero.Schema.schemaUpdatePromise.isPending()) {
+		if (Zotero.Schema && Zotero.Schema.schemaUpdatePromise.isPending()) {
 			yield Zotero.Schema.schemaUpdatePromise;
 		}
 		
diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index d0ff731ac7..a65b206620 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -789,7 +789,9 @@ Components.utils.import("resource://gre/modules/osfile.jsm");
 					Zotero.getString('startupError.checkPermissions')
 				]);
 				Zotero.startupError = msg;
-			} else if(e.name == "NS_ERROR_STORAGE_BUSY" || e.result == 2153971713) {
+			}
+			// Storage busy
+			else if (e.message.endsWith('2153971713')) {
 				if(Zotero.isStandalone) {
 					// Standalone should force Fx to release lock 
 					if(!haveReleasedLock && Zotero.IPC.broadcast("releaseLock")) {
diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index b754da3cc0..c91f098ee6 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -372,7 +372,7 @@ var ZoteroPane = new function()
 		}
 		_madeVisible = true;
 		
-		yield this.unserializePersist();
+		this.unserializePersist();
 		this.updateToolbarPosition();
 		this.updateTagSelectorSize();
 		
@@ -4508,7 +4508,7 @@ var ZoteroPane = new function()
 	/**
 	 * Unserializes zotero-persist elements from preferences
 	 */
-	this.unserializePersist = Zotero.Promise.coroutine(function* () {
+	this.unserializePersist = function () {
 		_unserialized = true;
 		var serializedValues = Zotero.Prefs.get("pane.persist");
 		if(!serializedValues) return;
@@ -4533,10 +4533,10 @@ var ZoteroPane = new function()
 		if(this.itemsView) {
 			// may not yet be initialized
 			try {
-				yield this.itemsView.sort();
+				this.itemsView.sort();
 			} catch(e) {};
 		}
-	});
+	};
 
 	/**
 	 * Serializes zotero-persist elements to preferences
diff --git a/components/zotero-service.js b/components/zotero-service.js
index 6fe1af8979..231eacff27 100644
--- a/components/zotero-service.js
+++ b/components/zotero-service.js
@@ -286,6 +286,8 @@ function makeZoteroContext(isConnector) {
 			subscriptLoader.loadSubScript("chrome://zotero/content/xpcom/" + xpcomFile + ".js", zContext);
 		}
 		catch (e) {
+			dump("Error loading " + xpcomFile + ".js\n\n");
+			dump(e + "\n\n");
 			Components.utils.reportError("Error loading " + xpcomFile + ".js", zContext);
 			throw (e);
 		}