I know there are a few things that are broken or wonky in the theme following the phpBB 3.1 upgrade (e.g., the "last visit" text at the top of each page; the 'key' at the bottom of the main page). I'll try to fix these tomorrow. If you spot anything else that's wrong, please let me know by posting in this topic.
If you don't want to use the Christmas theme, you can change the theme in your User Control Panel to the "Transport Tycoon (temperate)" theme. This is available year-round.
Enjoy the theme!
