I had a similar issue when I used PF3's own updater to update to 3.10 several days ago. The PF3 Display would show only the permanent key commands on the top and nothing on the bottom. I was not able to see any DEPT, DEST frequencies and so on (all were 0's). TGS Display wouldn't work either, but RemoteText worked. After my test flight, I just re-ran the installer that came with my original purchase and it fixed the issue. Now I am able to use the 3.10 and the updated PF3 Display normally.
I think it's possible I left TGS and PF3 Display running when I left the main PF3 application update itself. Anyway now I know what to try the next time something like this happens.