Make sure that you've got each notification not just set as 'new' as they each need configuring and saving as active (under active in the notification manager you will see either 'new', 'yes' or 'no'). Then make sure that each user has got them enabled. There isn't (in the last beta I've checked) a way of default activating them for each user yet, though that will be in the gold version automatically.
Can i have someone login to my Admin panel and see if i have everything correct? I'm also getting nothing to pop up when anything is received. It was working for the first day, then stopped. I haven't added anything or changed anything.