Hello Scorpius, Just wanna say you a big Thank you!! for Yappari. I love the N900 and the only thing I was missing is Whatsapp. I'm not a "fan" of applications like this but my brother and a lot of friends use it to not have to pay for SMS. So thanks for making the N900 even more complete and perfect. After using 0.0.10 I installed 0.0.13 and the Protocol error appeared, uninstalling Yappari and a new fresh install of 0.0.13 and registering again solved the problem. I'even received a message from the Whatsapp server with information about the new version of Whatsapp being available to download lol. Keep up the good work. Thanks, saludos.