Any idea why adb does not recognize my nexus 4 on mac

I can't figure out why my nexus 4 is absent from the list of adb devices. I've tried the following

• $ adb kill-server; adb devices
• $ echo 0x18d1 >> ~/.android/adb_usb.ini $ adb kill-server; adb devices
• Changed usb computer connection type to PTP instead of MTP
• Restarted the phone etc

Adb is on my path. Nexus 4 shows up when I view System Information.

I've tried asking on xda devs but no luck. Any suggestions on what I can try?

Thanks in advance

Very weird, I switched to a cheap chinese made cable and now adb sees my device.