This morning I got a notification that there was a new version of WhatsApp. I've been using it for about a month, quite happy with it.
I have a Torch 9800 on Rogers with 60.0.0600.
I upgraded via application world to 2.6.5917.
I did a re-boot as required after install. Went through the setting up of the application, entering the Phone number and user name, and got a message that it couldn't reach the server.
I un-installed it, booted, and re-installed. Went through the setup process again, and got the same message.
I didn't change any other settings. I checked the permission settings and they are set to ALLOW ALL.
Same thing happened to me this afternoon. After few attempts removing and reinstalling through AppWorld I saw this thread. Was able to successfully download from the Whatsapp site as suggested Cheers, Kazbah