The terminal stops reporting the card details, so there's just a long list of accepted jobs and submitted jobs but no 60 second block display of power usage or hash rate.  It ~seems~ random, but there may be some other issue that isn't being logged, like the momentary GPU glitch in the Nvidia driver which stops it from reporting the Memory Temp and fan speed.  Whatever it is, it works fine in 1.62, just not in 1.63.