Gee… that would bug the heck out of me.
If you have your usb controller plugged in and powered on (even before starting windows) CB should detect it.
My only other suggestion is to make sure you have the latest drivers for your Arturia Keylab USB MIDI keyboard installed.
If the forum members can’t assist then I would submit a support ticket to Steinberg.
Good luck.
Maybe you have a reason to support this request. 
Regards 