Hi,
I installed Xamarin Studio on windows 8.1 with visual studio 2013. I started to notice weird design-time only intellisense / type or namespace not found issues in Visual Studio where the local namespace in a project would be reported as not found in the project itself (I experienced that behavior in an asp.net mvc 5 web site project). Then, while trying to change the project's default namespace, I encountered a System.Runtime.InteropServices.ExternalException. A google search about this issue suggested that Xamarin's tools for visual studio could be the culprit. I completely uninstalled Xamarin and it fixed both issues.
Is this a known issue? I couldn't find information regarding xamarin tools and the namespace issue I mentionned.
Thanks!