Cart widget not updating until page refresh when products added.

Another MP3 issue. When adding a product on subsites to the cart the cart widget does not update until a page refresh. It used to update via ajax but doesn't since update. I can't check the same functionality on my primary site as there are no products yet there and after last update the whole global store is not working correctly and I am STILL waiting for a response to my other support request.

Please advise. Thank you.