pple's Logic X is now a 64 bit only application. Previous versions of Logic had the option to run in 32-bit or 64-bit mode, but Logic X no longer has this option. In order to use the Faderport in Logic X, you must either use the special 64 bit Faderport.bundle file:
Set up the Faderport in Logic 64 bit
NOTE: In Native Mode, you will see an entry in Controller Setup for the Faderport, but no image of the Faderport like you see in previous versions. This does not affect functionality.
Or alternately, set it up as a HUI device:
Set up the Faderport in Logic as a HUI device
