MS developer network

I'm running windows phone 8.1 developer preview. When I first installed the OS all my apps were working just fine, but over the past 10 hours or so I stopped getting notification for viber and whatsapp. So far I have reset the phone, uninstalled the apps
and back on again, but no luck.
If I remember correctly whatsapp was on my action centre list when you go to settings and look at the apps which can notify you, but their no longer there. I could be wrong and perhaps they were never there.
I'm curious is this because whatsapp and viber haven't been updated to meet the latest API to work perfectly with windows phone 8.1 or is it a bug? Or perhaps I can enable them on settings or something? And yes I have gone into the apps to look at their
settings also.
Suggestions and tips would be much appreciated.