George, on my sBitX V3 64bit (field day release), using the pull-down List to change frequencies (see the image) causes the system to "hang" or stop dead. No audio, the spectrum display is frozen. I can start other apps but the radio is stopped, no tuning, nothing. I timed it between 1.5 and 2.5 minutes and then it recovers and the selected frequency is set? as if nothing happened.
Bruce W4BRU