Just FYI (about 17 hours ago) postet on the Wazapp Facebook Page:

"So Wazapp has not been working for the past 2 days basically because Whatsapp has done a not-so-small upgrade to the protocol that I had to catch up with. I finally worked it out yesterday and will send out an update today. When this happens, you will get an update notification once you launch Wazapp. You can also follow up through this page, my twitter account (https://twitter.com/tgalal) or http://www.wazapp.im/

Tarek"