Whatsapp address book broken after BB OS update to 10.2

Hello,
after upgrading the OS version to 10.2, all my Whatsapp conversations show only the mobile number, not the name.
If I look in my Whatsapp contacts, there are only the letters "F" to "S"..?!
(I updated Whatsapp to the latest version too..)
Can anyone please help?
Thanks!

Uninstall the whatsapp app and restart the phone using the volume rockers. Then reinstall the latest version of the app, should work.

Tapped out on Halle (Black)Berry aka Z10 running 10.2.0.1791

Delete whatsapp...

No that is it - thats the solution.

#BBM4ALL