Yeah! I can finally cook on osx 10.6
The problem was with the file system not beeing case sensitive. I think this step is needed for most osx user. To resolve this you can simply created a .dmg with the disk utility application. Open "/Applications/Utilities/Disk Utility" and click on the "New Image" button. Set the size to at least 500MB (minimal, not sure it will work, I would recommend 1go) or more and for the format choose "Mac OS Extended (Case-sensitive, Journaled)". Now open the newly created .dmg and put the Kitchen in it.