Visual Studio 2010 hangs on attach to process / debugging

Whenever I try to debug a Visual Studio 2010 web project, VS hangs, and ultimately crashes. This happens if I try to start the project using F5, or through Attach to Process, before the process list even appears.

Hitting F5 in, for exampl开发者_JS百科e, a Windows Form project works fine, but attach to process fails here too.

Any ideas on what can be causing this? Obviously attaching to the devenv.exe process won't work as I can't get the Attach to Process dialog to appear...

Oh, running W7 (x64), VS2010 SP1 (had same problems without SP1)

In Solution Explorer there is a Show All Files icon (highlighted in the photo below):

Make sure it's turned off, When It's turned on, Visual Studio tries to index all the files in the solution and if you have a giant Solution it could take forever!

I hope this has helped someone :)

Have you recently installed Mono and/or Mono Tools for VS2010? I found that to be the problem it my case. Not sure why, but it somehow got in the way.

Matthew

In my case hangs when executable type was not correctly set, ex. Managed v4.0 and trying to attach to Native.