IPhone simulator breakpoints problem

Sometimes I got problem settings breakpoints. I found this solution in apple discussions:
As saggymac said:
“The default setting for debugging libraries and frameworks is Load Symbols Lazily. On occasion this causes breakpoints to not be hit. Turning off this setting makes it take longer to start debugging, but hits breakpoints more reliably.”
may be you should set this option OFF… (XCode-Preferences-Debugging)