At this point, it seems to be a Macbook problem, but I updated it to the latest version and tried to reset everything on there as well as made sure I ...

Yes it does. I've tested the MODX on two other laptops that seem to work fine, but the one I primarily use does not.

In the MODX: [UTILITY] > “Settings” > “MIDI I/O” = USB (green) Connect USB “TO HOST” port to your MacBook with appropriate adapter When you have ...