Re: Newer (rev 6) Ettus B200 (with AD9364) on SDR Console 2.3 or 3
Not sure whom I'm addressing, as there's no sig line in your post...that said, what USB cable are you using with V3? Per Simon's statement in the link below, "To ensure robust operation of the UHD.dll code you must use very high quality USB3 cables. Using USB3 extension cables seems to affect timing inside UHD.dll resulting in the software crashing with an access violation."
You'll find that and more info here: http://sdr-radio.com/Radios/Ettus-Research
Per that same page, Simon's had the Ettus B200 running "very well" at his home QTH since September 2014.