I have been using WebMatrix 3 and Visual Studio 2012 without trouble for a long time. Starting today, every time I open a WebMatrix 3 project in VS2012 and I launch it, VS2012 hangs and shows as "Not Responding" in the Task Manager. I can launch the project from within WebMatrix 3 and it does open the web browser and can successfully run the site's code. But when I try to run the program in VS2012 it hangs and I have to use the Task Manager to close the VS2012 IDE.
I tried creating a new starter project and the same thing happens with it. Note, I am able to run and debug non-WebMatrix 3 projects just fine, including MVC Web Roles. I tried restarting my computer and that did not help.
I found this article on how a "blocked" file can cause this kind of behavior in strange places:
http://digioz.blogspot.com/2013/06/visual-studio-2012-freezes-or-crashes.html
But I don't know how to determine which file(s) may be blocked. Also, I'm wondering if it's a weird problem with IIS Express. Has anyone seen this and knows how to fix it?
UPDATE: I've noticed that it takes nearly 40 seconds to open WebMatrix 3 projects VS 2012 and it never took that long before. After seeing a status line saying "Open Access Controls registers" in the status line, there appears to be a 30 second wait before project loading continues, a delay time curious close to the typical time-out setting for sockets.
Also, I tried switching from my default browser for IIS Express sessions from Chrome to Internet Explorer. The project ran find. However, the next time I ran it IE displayed the same "hanging" behavior as Chrome and after multiple attempts, never came back (still hangs)