Debugging with MonoDevelop not working when placing breakpoint

I'm trying to debug my Unity 3 project with Unity 3.1.0f3 and MonoDevelop (C#) that comes with it. I'm using a Windows 7 64bit pc.
When I follow the steps from the manual (http://unity3d.com/support/documentation/Manual/Debugger.html) I get an error saying Unity Editor is not working anymore as soon as the program hits the breakpoint.

I've tried to place a breakpoint on different positions in my code bug the result is constantly the same

What should I do?

 

Hi,

I encounter a similar problem: After installation of Unity 3.1, I cannot debug anymore. In fact, MonoDevelop does start Unity. But as soon as I hit Ctrl+P to start the game, it freezes. No breakpoint is hit. Unity just freezes.

The freeze does not occur when I start Unity stand-alone (not through MonoDevelop).

 

Hi,
First, make sure you have applied the Windows hotfix referenced at http://docwiki.unity3d.com/index.php?n=Main.TroubleShooting
Second, make sure you close ALL instances of Unity prior to launching the debugging session in MonoDevelop.

 

Everything worked fine before the 3.1 update. So, for me, the upgrade to 3.1 introduced the debugging problems I encounter.

 

I met this issue too. Does any solution for it?

 

http://unity3d.com/support/documentation/Manual/Debugger.html