If you have both a Korg OASYS sytem and a Mackie HUI and are running under Digital Performer 2.7 and you are getting stuck notes with the OASYS and/or other weirdness, make sure under the OASYS Preferences that you do NOT have 'Respond to OMS/FreeMIDI' messages checked.

If it is checked, you are simply creating a MIDI loop where the HUI is sending out it's communication messages to DP which are getting intercepted by the OASYS sytem.