During the past two days I've tried to purchase several new Apps. I tap "Buy" , enter my iTunes password, and the App's logo appears on my Home screen, but instead of the blue installation progression indicator the logo is labeled underneath with the word "waiting"... And remains so labeled until I tap the logo when it changes to "paused". Another tap returns it to "waiting", The same thing happens when I tap "update" for other Apps i've already bought and used. Any App labeled "waiting" is non-functional. Several of these Apps are ones I use frequently and this has really put a devastating crimp in the use of my iPad! What should I do?