Suddenly, I can not overflow anything in VS2010


Since yesterday I cannot debug and step into any source code in VS2010. It is displaying the text as shown in the screenshot below. Whenever click on "Browse to Find Source" The text changes to the following:

No source available. The source code cannot be displayed.

The funny thing about this screenshot is that it states that it actually could find the correct source file with the correct checksum.

What could have happend here and how do I fix it?

In the example below I have setup a simple windows forms application project and set a breakpoint in the form's constructor and then hit f5.

Update: When I start the application separately and then attach to it later, everything works fine. I can hit the breakpoints.

I have no idea why this happend but resetting the visual studio settings did the trick.