Dashboard icons and widgets Not expanding

Hello there

coming with a fuzzy problem

my dashboard icons and my theme widgets are not expanding any more

I deactivated all plugins and reactivated them again but that didn't help

I updated my wpmu to 2.9.2, thought that would help but noting changed

it seems all ajax effects are not working with my website

I'm using wpmu 2.9.2, buddypress 1.2, bbpress 1.0.2

Please I need help