I asked the support for a working next beta...
Nothing received but the autoresponder with the ticket number.
Beta6 is unusable. You can't trust it. Here are the issues:
1. Dude stops to watch our network
2. Alerts are sent without any reason
3. If you have a notification schedule (for example "not in the deepest night" 23:00-06:00)
you will not received notifications about devices are down in the night. It is really a nice
surprise to have a friendly customer at 06:30 at the phone and you are thinking everything is
ok.
I will wait two again two weeks. If then nothing happens I will return to WhatsUp.