I'm having the same problem with no text on any of the menus in the game. I threw that attached font file into the folder, but no dice. It was already there and adding the new one didn't change anything.
Running on Vista, medium graphics settings. Also I see the shell map but nothing's actually happening on it, the camera pans along but there are no battles going on. I don't know if it's supposed to be that way but it seemed worth mentioning.
I also installed the "improved" launcher but as far as I can tell it didn't do anything at all.
Oh dear! :roll:
EDIT: I have fixed the problem. For some reason the font file was blank, and windows somehow kept that blank file in memory regardless of the fact I replaced it with brand new files from here and elsewhere on the internet. This was solved by deleting the RussellSquare.ttf file, restarting the computer to wipe the blank one from memory, then redownloading the file again. Now it is no longer blank and works fine.