Visual Studio 2008调试器的问题

I have a weird problem with Visual Studio 2008 in just one of my projects. When I set a break point on a line of code, it gets hit alright, but when I try to 'step over,' or whatever else that is supposed to pass over that break point and stop on the next line, the code gets executed and continues as if I hit F5. This occurs even if I have another break point on the line just after this one, and strangely, the second break point is ignored (sometimes).I have a weird problem with Visual Studio 2008