Hi, I am using a US-4x4 interface on both, a PC (Windows 7) and a Mac (OSX 10.13 High Sierra). On both, I am using Ableton live with a plugin called "Circular Labs Mobius". Audio works fine on both environments. Midi works great on the PC, but not on the Mac - there, the plugin misinterprets some of the commands send from a midi foot controller (and other controllers as well, I checked that). I am sure, that the software is configured correctly on the Mac: When controlling the software from a USB-Keyboard (M-Audio O2), everything works like it should. Tricky, uh? Any hints are highly welcome. US4x4 is on latest patch-level (done via the PC, if that matters). Already removed the interface/drivers (Audio-Midi-Setup) and reconnected the device. Any help welcome!