Folks, I think there is/was a real issue with Whatsapp on Win8Phones and I think they realized it and so I'm glad they've taken it down to fix it. I've been working with Nokia Support for the last week trying to figure out why my Lumia920 keeps locking up at least once a day (tons of other folks are experiencing the same problem). We finally got it to a state where I factory-hard-reset the phone, ONLY setup Google+Microsoft accounts and installed Whatsapp, and it STILL locked up. Since yesterday, I've been testing the Lumia920 again but this time with Whatsapp uninstalled and - guess what? - so far no lockups! It's still too early to tell if Whatsapp was the cause (only 14hrs into this latest test run) but I see that Whatsapp was taken off the marketplace yesterday. Coincidence?
I am pretty sure Whatsapp Inc. WANTS to have whatsapp on the Windows8Phone platform, but they must have identified a problem with the app. Here's to hoping they fix it soon.