Since installing the OS X 1.1.3 update of the B4 Organ, I cannot recall my older presets stored in Logic 5.x or Logic 6.x on OS X. I can create new presets and it will recall them, but I can't retreive my older ones, of which I have many.
Use the Disk Utility to repair permissions on your OS X disk. You can find more on this under the Apple KB article here:
docs.info.apple.com If after repairing permissions they still will not load, try to change the preset permissions manually by clicking on the preset files once, then pressing Apple-I. Move down to the ownership and permission section and make sure you have "read and write" capabilties.