Have had the 6300 for over a year and have used WSJT-X all of that time. Windows 7 computer and mini-deluxe HRD interface. Just did a clean reinstall of Windows 7 on the dedicated computer for the rig and everything is working except...WSJT-X will not release MOX after 48 seconds. The signal does end at the appropriate time but it will not return me to RX and I have to do it manually. I have no other 3rd party communication or logging programs running at the same time. I recall this happening about a year ago but forgot how I solved it.