diff --git a/htdocs/frontend/javascripts/functions.js b/htdocs/frontend/javascripts/functions.js
index 370bd178d..6fc5353c1 100644
--- a/htdocs/frontend/javascripts/functions.js
+++ b/htdocs/frontend/javascripts/functions.js
@@ -96,10 +96,10 @@ vz.getPermalink = function() {
 vz.load = function(args) {
 	$.extend(args, {
 		accepts: 'application/json',
- 		beforeSend: function (xhr, settings) {
- 			// remember URL for potential error messages
- 			xhr.requestUrl = settings.url;
- 		},
+		beforeSend: function (xhr, settings) {
+			// remember URL for potential error messages
+			xhr.requestUrl = settings.url;
+		},
 		error: function(xhr) {
 			try {
 				var msg;
@@ -112,11 +112,20 @@ vz.load = function(args) {
 					}
 				}
 				else {
-					msg = xhr.requestUrl + ':<br/><br/>Unknown middleware response';
+					msg = "<a href='" + xhr.requestUrl + "' style='text-decoration:none'>" + xhr.requestUrl + "</a>";
 					if (xhr.responseText) {
 						msg += '<br/><br/>' + $(xhr.responseText).text().substring(0,300);
 					}
-					throw new Exception(xhr.statusText, msg, xhr.status);
+
+					var title = "Network Error";
+					if (xhr.status > 0) {
+						title += " (" + xhr.status + " " + xhr.statusText + ")";
+					}
+					else if (xhr.statusText !== "") {
+						title += " (" + xhr.statusText + ")";
+					}
+
+					throw new Exception(title, msg);
 				}
 			}
 			catch (e) {
diff --git a/htdocs/frontend/javascripts/wui.js b/htdocs/frontend/javascripts/wui.js
index 92264eec8..948ed848f 100644
--- a/htdocs/frontend/javascripts/wui.js
+++ b/htdocs/frontend/javascripts/wui.js
@@ -834,9 +834,12 @@ vz.wui.dialogs.error = function(error, description, code) {
 		error = code + ': ' + error;
 	}
 
-	$('<div>')
-	.append($('<span>').html(description))
-	.dialog({
+	// make error messages singleton (suppress follow-on errors)
+	vz.wui.errorDialog = true;
+
+	$('<div>').append(
+		$('<span>').html(description)
+	).dialog({
 		title: error,
 		width: 450,
 		dialogClass: 'ui-error',
@@ -844,6 +847,7 @@ vz.wui.dialogs.error = function(error, description, code) {
 		modal: true,
 		buttons: {
 			Ok: function() {
+				vz.wui.errorDialog = false;
 				$(this).dialog('close');
 			}
 		}
@@ -851,5 +855,6 @@ vz.wui.dialogs.error = function(error, description, code) {
 };
 
 vz.wui.dialogs.exception = function(exception) {
+	if (vz.wui.errorDialog) return;
 	this.error(exception.type, exception.message, exception.code);
 };