Double Trouble (and content!)

Hi there!
Ha have a website/blog built with WordPress 2.0.5 which have worked fine so far.

Today, apparently without having changed anything important, all pages’ content is displayed TWICE!

see:
https://www.underworld-game.net/?page_id=3

Surely there must be some cause somewhere. I have several plugins running and I will of course perform some tests now.

Is there any debug “echo” instruction that I can place somewhere to understand why the content is being printed twice? I mean, is there some tip you can give me to get “thebeast by the balls”?

Thanks a lot!

–Cris