I'm no python scripter, but with my limited knowledge my guess would be that the main-menu images for buttons and so on are missing.
I would hazard another guess, there has been some error during the download and/or unpacking of the files. If you can, make sure the archive is intact and unpack again. 7-zip logs errors, if there are any.
Also, please mention the OS you're playing on and if it is Android, check the FAQ-Guide to make sure there weren't any mistakes on your end.
AND: Patience! Realistic is and answer after a day or three ;)