After adding another keyboard layout, besides default English, Fn combinations do not work anymore.
I added Russian layout to the list. Now I can switch to Russian and type Cyrillic letters, but Fn combinations do not work even in English layout! I can't even type "-" or "=", so the keyboard goes almost unusable. When I remove extra layout, leaving only default English, everything goes back to normal.
Yes, I set keyboard to "Planet Computers Cosmo Communicator" on Hardware tab of Settings, but didn't notice any effect.