After several days of VNC remote FT8 operation, today I had a 1000 Hz tone, apparently sourced from DAX, that was evident on both wsjt-x and when I opened Winwarbler as a test. There was no other receive data. Cold reboot of my 6700 seemed to clear the problem.
Using SmartSDR/DAX 2.0.17 and yes on the cold boot. I did a complete removal of Flex software before installing 2.0, and I also remove DC from the 6700 when it is idle. I don't have a screen capture and have yet to successfully do one while using TightVNC to remotely access the PC where the 6700 is connected. This tone was visible only on the server PC wsjt-x FT8 display and no other FT8 signals were displayed on wsjt-x from busy bands and no tone was visible on SmartSDR on quiet bands or any band as I recall. The tone disappeared when DAX was deselected or shut down. It persisted through several restarts of both DAX, SmartSDR and wsjt-x and only disappeared when the 6700 was power cycled. I saw no evidence the tone was any sort of RF signal and it mostly seemed to be generated by the Flex/DAX software and delivered pretty much normally to both wsjt-x and to Winwarbler, but without any simultaneous delivery of real signals. Last, the signal looked very much like a strong FT8 signal on the wsjt-x display centered on 1000 Hz, not a clean cw like signal. I believe these observations are correct, but I didn't do any exhaustive analysis or keep notes. So, remote operation, beta wsjt-x software, weak problem reporting on my part, new SmartSDR version, and only one instance so far. Why would this be difficult to analyze? I intended this report mostly to be a placeholder in case anyone else had the same issue. Thanks.