When I try to use the debugger and click on the Step Over button, most of the time the arrow indicating the active line of code dissapears, the debugger stops and the MacOS X spinning wheel appears, often followed by a message: debugging engine not connected to IDE (or maybe IDE not connected to debugging engine, I am not sure).
The strange think is that this may or may not happen at the same breakpoint, but I can't understand why. Any suggestion?