Actually my meter, or it's operator is an idiot. With external power it's working fine- must be too little juice on the USB. I'm using the variable power supply option anyway, so an extra brick is no factor. I'm good now.
I can't get my brand new AD2 to connect to my Mac. WaveForms2015 reports No device found. I don't know if there's any kind of power LED on the Discovery 2, but if there is it's not illiuminated. I followed the guide here: https://reference.digilentinc.com/learn/instrumentation/tutorials/ad2-waveforms2015-installation-osx/start and rebooted as well. Meter says 1.2A off the USB on the Air. No love. Help!