Steve and Mark,
My last response was wrt the wrong question. Sorry. Different problems.
The keyboard shortcuts in my new Sierra install still do not work. The
screen shot keyboard sequence worked once on the new install and then
nothing. Many of the listed shortcuts in Preferences are now
non-functional. No biggie because I rarely used them anyway, but now that I
am aware of the problem it has me curious.
Similarly, I have a hackintosh running El Capitan as a backup to my only OS
X machine. It’s pretty new, haven’t used it much at all beyond setup.
The screen shot shortcut worked once, the first time, and now anything
related is non-functional. This is true of several of the other default
shortcuts on my main Mac…
I suspect it may be related to the Logitech mouse software I have installed
on both computers, the unifying package. One of these days when I have time
to kill I may revisit it.
I am used to using a multi-button laser mouse for my CAD work, so I don’t
want to uninstall the Logitech preference pane for now. Too busy.
For now I will just use Grab for screenshots. The Sierra version of Grab
lets me choose the output file type, and I prefer .png to .tiff.