Tridion User Interface 2012 - Can't find Razor helpers when creating pages/inserting content

I'm working with Tridion 2011 SP1 and Razor templating but have an issue with creating pages and inserting content through the User Interface 2012. It appears when I try this that my Razor helpers, namespaces and assemblies listed in the Tridion.ContentManager.config file don't get included.

I tried adding the references to the helpers directly in the razor templates and everything works fine but I would prefer to not have to do this in every Razor Template.

When I try creating a page through the UI I get the following Razor error:

TemplateCompileException: CS0103: The name 'GetBreadcrumbStatus' does not exist 
in the current context Line 64 Column 21: if(GetBreadcrumbStatus())

My Tridion.ContentManager.config file contains the following for the Razor Mediator:

<razor.mediator cacheTime="600" extractBinaries="true">
 <namespaces>
  <add namespace="Tridion.Extensions.Mediators.Razor.Models" /> 
  <add namespace="System.Linq" />
 </namespaces>
 <imports>
  <add import="C:\Program Files (x86)\Tridion\Razor Mediator\Helpers\GeneralHelper.cshtml" />
 </imports>
</razor.mediator>

Any ideas as to why the UI doesn't include the helpers and namespaces unless there referenced directly in the Razor templates?

Thanks in advance.