LOL. They are identical! In any case, I am getting used to using Xcode to debug. It helps that I can still make GUI changes in Lazarus and have them instantly updated in Xcode. Obviously, this represents a mystery to be solved but it's not massively urgent. I guess we'll just have to wait for Lazarus 2.0, in which all the debugging shortcomings will have been solved!
Cheers,
Carl