trouble with bp corporate

Hi,

this is my website isexl.com

and i've troubles :

first FORUMS

the link to go to the forums doesn't work : http://isexl.com/forums/
the link inside the groups doesn't work either : http://isexl.com/groups/pecha-kucha/forum/
when at least i can go on the url with a forum it's not integrated : http://isexl.com/groups/pecha-kucha/forum/topic/titre-livre

second WIDGET :

I can't find the widget "SITE wide activity"

Tks for your help

Régis