Problem with buddypress 2.8.0

Hi ! (sorry for my bad englush …)

Thank you first of all for your work which is great!

Buddypress has just been updated, and causes a big problem with my site
( http://www.gamimension.fr/ ), only the menu header appears, all the content of the site is invisible when I activate buddypress 2.8.0 .

Could you help me find the problem to allow me to correct this?

(There is only buddypress activated on my site)

Thank you !