Most annoying thing to ever happen: Configuration manager screwup

I think I was pretty close to a major nervous breakdown due to this one misconfiguration of my Visual Studio that I have no explanation for:

Imagine yourself trying to test some new behavior that according to your unit tests works, but simply refuses to work inside your web-app because the call to it hasn’t been compiled yet!

Breakpoints don’t get hit, changes don’t appear.. Mayhem! (Oh, and to top it off, since views aren’t compile you still see some of your changes, just not the ones in real code).

I first thought it’s some problem with the ASP.NET MVC project type, but eventually I noticed that if I don’t manually recompile the project none of my changes appear.

Way to go, I should have seen that yesterday instead of spending almost an hour hunting bugs where none where to be found.

Update: To add insult to injury I again forgot that checkbox turned off after taking the above screenshot.