Unable to type in Visual Studio

Question

I am unable to edit any files in a project in Visual Studio 2013. It only happens in one project. If I open a different project I am able to type fine, but once I go back

Answer 1

Are the files in question read-only? That might explain why you can't change them.

I'm not familar with SVN, but in some source control systems, you have to check-out a file before you modify it.