I haven't read of this problem before ( Ctrl + arrow keys quit working). So all I can think to offer is to try some of the troubleshooting tips that help when having problems with Ctrl-Shift-C
Troubleshooting Ctrl-Shift-C Not Working / Cheats Not Working
http://www.carls-sims-4-guide.com/forum/index.php?topic=23632.msg411671#post_CNWFor testing purposes, try another keyboard to see if that helps.
Some programs may be interfering with those keys working properly. Thinking screen capture and/or chat programs such as Gyazo, Skitch, and/or Skype. Disabling these may help. - See the post linked above for more info on these programs.
If mods/cc are install, move the mods folder to desktop to see if that helps.
Repairing the game may help. To do that, right click on the sims 4 icon in the Games Library tab in Origin and click Repair.
Exit game and then load game again to see if that helps.
Delete the localthumbcache.package from inside the Sims 4 folder and try again.
Try a Factory Reset - (How-To link below)
http://www.carls-sims-4-guide.com/forum/index.php/topic,21899.msg401669.html#msg401669Try a Clean Boot to see if it helps.
Clean or safe boot your PC or Mac
http://help.ea.com/en/article/how-to-clean-boot-your-pc/