I do not understand this XCode 3 behaviour

FROM : Gerben Wierda
DATE : Mon Nov 26 20:39:16 2007

I have upgraded to Leopard and installed the new developer tools. I 
can open and compile my project. But it seems  whatever I change does 
not end up in the app when I want to run it via the debugger. That is, 
I set a breakpoint on a message that is displayed in a view and I see 
the message, but there is no breakpoint. So I change the message to 
something else, rebuild and debug and the message has not changed. I 
did not try to run outside the debugger. I did a complete clean 
project, but that did not help.

In other words, I build my app, run it from XCode but none of my 
changes take hold.

Is this a common misunderstanding when upgrading? Something I should 
change in my setup?

Thanks,

G