Converted project to .Net 4.5 - now lots of R# XAML errors

I've loaded a VS2010 solution into VS2012, and changed each project's target framework from 4.0 to 4.5. Now, R# is reporting many thousands of errors throughout my XAML files. Here is an example of it's suggested action:-



It seems that R# wants to prefix the XAML element with their namespaces. If I apply the suggested changes then the above changes to:-




Why is this happening, and is there a way to stop R# raising these errors? I'm using R# v7.1.3 by the way.