Package 'Microsoft.VisualStudio.TeamArchitect ....... did not load correctly ...' after installing Update 4 in VS 2013

I get the following error whenever I start VS2013 Premium after installing Update 4. (Run as administrator, PC is in home office)

Is there a fix please?

What is SetSite doing, what is it complaining about?

I am not using TeamArchitect, so can I disable it?

Note. I may have tried removing the premium and then installing the pro at some point (because my msdn subs are professional, but the msdn downloads offer a premium as if I was entitled to it), but this is an impossible task without reformatting as it keeps telling me i have everything i do.

File log section of interest

  <record>818</record>
    <time>2015/01/09 09:10:46.299</time>
    <type>Information</type>
    <source>VisualStudio</source>
    <description>Begin package load [Microsoft.VisualStudio.TeamArchitect.DesignersCommon.DesignersCommonPackage, Microsoft.VisualStudio.TeamArchitect.DesignersCommonPackage, Version=12.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]</description>
    <guid>{59E21B88-8E88-47DE-9FEE-935FA485AF40}</guid>
  </entry>
  <entry>
    <record>819</record>
    <time>2015/01/09 09:10:46.304</time>
    <type>Error</type>
    <source>VisualStudio</source>
    <description>SetSite failed for package [Microsoft.VisualStudio.TeamArchitect.DesignersCommon.DesignersCommonPackage, Microsoft.VisualStudio.TeamArchitect.DesignersCommonPackage, Version=12.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]</description>
    <guid>{59E21B88-8E88-47DE-9FEE-935FA485AF40}</guid>
    <hr>80004003 - E_POINTER</hr>
    <errorinfo>Object reference not set to an instance of an object.</errorinfo>
  </entry>
  <entry>
    <record>820</record>
    <time>2015/01/09 09:10:46.304</time>
    <type>Error</type>
    <source>VisualStudio</source>
    <description>End package load [Microsoft.VisualStudio.TeamArchitect.DesignersCommon.DesignersCommonPackage, Microsoft.VisualStudio.TeamArchitect.DesignersCommonPackage, Version=12.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]</description>
    <guid>{59E21B88-8E88-47DE-9FEE-935FA485AF40}</guid>
    <hr>80004003 - E_POINTER</hr>
    <errorinfo>Object reference not set to an instance of an object.</errorinfo>
  </entry>