No forms work immediately and reply vanishes

I am having major problems with my BP install. I know this should be there but no one EVER answers there and you are the experts.

On all my replies, I click to reply, the page opens with the reply box then it sort of slides out of sight. Vanishes. Nowhere to reply.

If someone accepts a friendship request it does not show it has taken, at all. it HAS taken but they have to refresh to see that.

If I want to to favourite a piece someone has written it does nothing

Nothing works at all.

Please can someone help?