Hi Craig,
The problem here is that the server is returning a 500 error when ScriptResource.axd is called. Because this returns a 500 error, javascript which supports the cog button isn't working so the cog button doesn't work.
The 500 error result on that call is likely due to the server not being properly configured. Luckily, we can get around it by uncommenting the following in your web.config. I've already done this for you on your site.
<add name="ScriptResourceIntegrated-4.0" path="ScriptResource.axd" verb="*" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" resourceType="Unspecified" preCondition="integratedMode" />
Thanks,
Joe