I get the impression that M-Audio Direct Link does not support 64 bit. I just bought an Oxygen 88. After much scrambling about I realised it's not going to work until they release updated software. I can't find out approximately when that will be.
Logic Pro X - 10.3.3 - Mac Pro - 2 x 2.8 Quad Core Intel Zeon - 32GB RAM, OS X 10.11.6, M-Audio Oxygen 88 MIDI Controller, EX-P Expression Pedal, TEC Breath Controller, Sample Modeling Complete Library, Garritan GPO4 and JABB 3, LASS First Chair, Chris Hein Solo Violin, Emotional Cello, London Solo Strings, Mojo Horns, Session Horns Pro, Session Strings Pro, EWQL Diamond Strings, Brass and Orchestral Woodwinds, Brush Artistry 2, Focusrite Saffire PRO 14, Yamaha HS50 Monitors.