Hello Guys, just had the same Shortcut problem in SU 2017 after new update. And i found a good comment for 2015 version suggesting to go to “Window” >> “Preferences” >> “Shortcuts” and select “Reset All” it also dose the job for 2017 assuming also for 2016 how ever THAT made the shortcuts come back for me working fine now. hope it dose same good to you 
Have fun and nice drawings and constructions. !!