First, have searched and read many similar questions on here and they do not seem to be the same, they are either 14.X or for vanilla Gnome. This is 17.10 Unity.
The situation:
- Upgraded two computers to 17.10
- Switched both back to Unity for several reasons, screenshots being one of them
- On one computer, screenshot app works as usual, especially Shift+Print I use a lot
- On the other, the shortcuts do nothing. In preferences, they are set as they should, and I can press Print there so the keyboard is working
- I can invoke gnome-screenshot manually
So, for some reason, on one computer the Print shortcuts just do nothing while everything does seem to be in place and a similar installation does work.
Any ideas?