On the Windows 7 machine sometimes my computer clock doesn't want to bother setting itself to the correct time if it's only a few seconds off, which can mean the difference between success and failure when trying to use modes like FT8. This happens even when manually going into clock settings to update the "internet time" via the time.nist.gov (or similar time standards). You can see when the clock is off by looking at the waterfall display - if transmitted signals are delayed a second or so there will be a gap between the horizontal green line indicating the start of another 15-second interval and the start of transmitted signals. Of course sometimes people will click to transmit late causing a gap, but if every signal has a gap then you know your clock is off. If you're not receiving text from the signals seen on the waterfall that could also mean the clock is off. Or worse, someone comes onto your frequency with a message saying "ck computer clock." Now that can be embarassing, and it's happened to me despite manually updating my "internet time." So here's the fix that I found: I've found that if my computer refuses to cooperate, all I have to do is go in and manually reset the clock to the wrong time - several seconds off, then I go in again and set it via "internet time" (time.nist.gov) and it stops being lazy and really sets the time!