Oops, wasn't clear. Double click the top button launches screen capture. One click does nothing when unit on running. Odd, since screen grab is a one note feature.
BTW: it's a SP3 i5/256 Windows 10.
Update: Did all the trouble shooting recommended & nothing was amiss. Restarted twice, checked for Win updates & now it is working as advertised??? I will keep an eye on it.
kev