Nothing jumps out at me when doing searches on that so the next thing
to determine is whether it's the Lucid to Maverick update or Maverick
itself at fault. To do this you'll need to download the Maverick ISO
and create a CD then boot up with that. Select the 'Try Ubuntu' option
and when you get to the desktop check whether your wireless keyboard
works correctly or not.

If it work using the Live CD then the issue is with the actual update
from Lucid and as has been posted many times updates can be *iffy* no
matter which OS we are talking about !!

FWIW for a system that's needed daily I'd recommend sticking with the
10.04 LTS and leave cutting edge to either a second system or perhaps
a virtual machine ( using Virtual Box or similar ) to see what's being
developed.