Adding/Removing rootDirs will refresh UI properly.

NzbDrone.Web/Scripts/NzbDrone/addSeries.js

@@ -45,7 +45,7 @@ $(".addExistingButton").live('click', function () {
 
 function reloadExistingSeries() {
     $.get(existingSeriesUrl, function (data) {
-        $('#existingSeriesTab').html(data);
+        $('#existingSeries').html(data);
     });
 }
 

NzbDrone.Web/Views/AddSeries/Index.cshtml

@@ -10,12 +10,12 @@ Add Series
 <div class="jquery-accordion">
     <h3>
         <a href="#">Add New Series</a></h3>
-    <div>
+    <div id="addNewSeries">
         @{ Html.RenderAction("AddNew", "AddSeries"); }
     </div>
     <h3>
         <a href="#">Add Series Already on Disk</a></h3>
-    <div>
+    <div id="existingSeries">
         @{ Html.RenderAction("ExistingSeries", "AddSeries"); }
     </div>
-</div>
+</div>