Modifier Keys stopped working

[HandMadeMonster]

yesterday all of a sudden my modifier Keys stopped functioning properly. Shift select does not work on the keyboard, although it works with the Wacom when I configure one of the buttons to the modifier "shift", other key combinations stopped working as well.
I did a clean install, alas the problem persists.
Am I alone with this?
Mac Pro 2013. Sierra 10.12.2, apple keyboards

Thanks for any kind of help

 

[wrldwzrd89]

Since you did a clean install and the problem is still there, the offending setting is probably in your user account. To check if this is the case, create a new user and test with it. If the problem goes away, my suspicion is confirmed. Go back to your regular user account, then System Preferences -> Keyboard. Check the various sub-panes in there, particularly the Shortcuts pane and the Input Sources pane. Either one of those could be configured in such a way that would make your keyboard act oddly.