Reinstalled the latest version for the third time. This time sms registration worked fine (though slow). Here are the problems I'm facing:

1. Startup takes several tries and ages, but eventually it does start. Might require a couple of reboot as well. It gives the "Loading..." screen, which just dissappears after a while without the app opening.
2. Keeps giving the "Wazapp is not responding" error message
3. My messages are sent, but it shows them as unsent.
4. Receiving messages is completely arbitrary, but seems to happen more often soon after startup (the messages delivered are usually reeally old)
5. Trying to send attachments: it's possible choose any other type of file (in which case the program jumps to the appropriate folder for content) except for pictures (in which case it shows a blank screen with the legend "Choose a picture" and freezes the whole phone) - I haven't actually gotten quite as far as actually sending an attachment yet (one try of a video froze the whole phone)
6. Group chat doesn't show any messages received after switching to a new version which supports push names
7. Received group chat messages show up in notifications, but not in the app. Clicking on the notification opens a blank page and freezes the app. It's possible to swipe it shut, but it won't reopen again before rebooting.
8. Sending a group chat message - it ends up in the same limbo as all the new group chat messages
9. Occasionally freezes the whole phone so no other apps can be opened and the phone needs to be rebooted