Guys,

I noticed the problem and the only thing I can think about is that they somehow detected who registered with third-party applications and flagged them to force them to re-register, because WhatsApp Inc. knows we can't register anymore.

The error you're getting (if you read the logs) is "not authorized" like when you try a wrong password.

I wonder if people that registered using NITDroid also have the problem?

Looks like it is the end of Yappari.