Unable to publish

Hi, 

I have been struggling to publish anything for the past few days, whenever I publish I get the following error. 

<?xml version="1.0" encoding="utf-16"?>
<ErrorReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <UserId>aid|cf5a93f0-d3c2-47af-8f7c-c438451168f9</UserId>
  <HardwareId>9RKVT-A4KFC-03F9P-1AUU9-VT1PR</HardwareId>
  <Message>An item with the same key has already been added.</Message>
  <StackTrace>   at void System.Collections.Generic.Dictionary&lt;TKey, TValue&gt;.Insert(TKey key, TValue value, bool add)
   at Dictionary&lt;TKey, TElement&gt; System.Linq.Enumerable.ToDictionary&lt;TSource, TKey, TElement&gt;(IEnumerable&lt;TSource&gt; source, Func&lt;TSource, TKey&gt; keySelector, Func&lt;TSource, TElement&gt; elementSelector, IEqualityComparer&lt;TKey&gt; comparer)
   at IDictionary&lt;ushort, ushort&gt; Articulate.Player.PlayerText+FontItem.get_GlyphMap()
   at bwFonts Articulate.Player.PlayerText+Fonts.Save(IPlayerService service, bwContent content, PlayerFontEmbedDefinitions playerFonts)
   at bool Articulate.Player.PlayerWriter.Write(IPlayerContentProvider contentProvider)
   at bool Articulate.Design.Publish.PublishWorker.PerformPublish()
   at void Articulate.Design.Publish.TargetContext+PublishBackgroundWorker.OnDoWork(DoWorkEventArgs e)
   at void Articulate.ComponentModel.STABackgroundWorker.WorkerThreadStart(object argument)</StackTrace>
</ErrorReport>

Odd, it's literally just a question bank nothing too complex but just stopped working I did a few sections of the same question bank in other projects and it worked then just stopped, presenting the above. 

Jake