The latest version of CodeWarrior that supported Mac OS X developement was version 10. The short answer is that the version of CodeWarrior that you're using probably doesn't play well with Mac OS X 10.4, as I know some significant changes were made to the APIs for Tiger. Also, Freescale no longer supports desktop development for Mac OS and Windows and has stopped support for these product. CodeWarrior is now used for embedded development and Linux work. Sorry I can't offer any more help than that explanation.
---Tom