If you see notifications, but no messages in WhatsApp, you may also be experiencing these problems:

• Outgoing messages stay as a clock and never proceed to the single check mark.
• "Not connected" in WhatsApp settings > account > Connection state.

This typically indicates a problem with your phone's network connection. On Windows Phone, notifications and messages use different types of connections, so it's possible that the connection used to deliver a message may be disconnected while the connection used to deliver notifications may still be active.  Push notifications come through a connection to Microsoft's servers, whereas messages come from a connection made through WhatsApp servers.  This means that you may receive the notification from Microsoft, but WhatsApp cannot connect to the internet on your phone, which means that you will not be able to receive your messages.  You can usually solve this by adjusting your phone's network settings.

Please carefully follow the steps in this article to properly configure your phone's network connection.

Cheers,
WhatsApp Support Team