Here is the ‘ioreg -p IOUSB’ output from my mac. I have the arduboy switch to the right, which should be ‘on’.
Clearly it’s not even showing up at the moment 
bolen@207-181-230-92 ~ % ioreg -p IOUSB
+-o Root <class IORegistryEntry, id 0x100000100, retain 14>
+-o Root Hub Simulation Simulation@14000000 <class AppleUSBRootHubDevice, id 0x1000002f5, registered, matched, active, busy 0 (5 ms), retain 10>
+-o BRCM20702 Hub@14300000 <class AppleUSBDevice, id 0x1000002f6, registered, matched, active, busy 0 (108 ms), retain 12>
| +-o Bluetooth USB Host Controller@14330000 <class AppleUSBDevice, id 0x100000348, registered, matched, active, busy 0 (130 ms), retain 17>
+-o Apple Internal Keyboard / Trackpad@14400000 <class AppleUSBDevice, id 0x100000306, registered, matched, active, busy 0 (498 ms), retain 22>
+-o USB2.0 Hub @14100000 <class AppleUSBDevice, id 0x100000d15, registered, matched, active, busy 0 (70 ms), retain 14>
| +-o USB2.0 Hub @14110000 <class AppleUSBDevice, id 0x100000d2f, registered, matched, active, busy 0 (63 ms), retain 12>
| | +-o Fitbit Base Station@14114000 <class AppleUSBDevice, id 0x100000dae, registered, matched, active, busy 0 (115 ms), retain 21>
| +-o Kinesis Keyboard Hub@14120000 <class AppleUSBDevice, id 0x100000d5a, registered, matched, active, busy 0 (86 ms), retain 12>
| | +-o IOUSBHostDevice@14122000 <class AppleUSBDevice, id 0x100000dd2, registered, matched, active, busy 0 (96 ms), retain 13>
| +-o IOUSBHostDevice@14130000 <class AppleUSBDevice, id 0x100000d93, registered, matched, active, busy 0 (58 ms), retain 11>
+-o USB3.0 Hub @14500000 <class AppleUSBDevice, id 0x100000d41, registered, matched, active, busy 0 (67 ms), retain 13>
+-o USB3.0 Hub @14510000 <class AppleUSBDevice, id 0x100000dfa, registered, matched, active, busy 0 (69 ms), retain 11>
+-o IOUSBHostDevice@14530000 <class AppleUSBDevice, id 0x100000e11, registered, matched, active, busy 0 (59 ms), retain 11>
While I was doing some uploading before the board stopped responding, i was seeing some USB errors, such as the device wasn’t available, or timed out etc… I didn’t really pay it much mind at the time, just hit CMD-U again and it would work…
This is the same output with 2 different cables, i’ll try another mac shortly…
B