Why does F10 (step over) in Visual Studio not work?

Question

I\'m debugging a (web) project in Visual Studio 2008. I\'m hitting a breakpoint. F10 continues to the next line, as expected, but the next F10 just stops debugging and the code

Answer 1

I was having this issue while developing a Web App that was running on IIS on my local machine. I found that opening the task manager and killing the process (w3wp), then trying again made the problem go away temporarily.