Update.
I made simple uninstall -no cimplete purge- and Wazapp launched.
However message sending malfunction persists.
It goes lik this:
When pressing Enter key after writing a message it disappears. No message bubble in the message screen.
Of course, nothing is sent.
But nothing is received also. Users at the other end of the line say they see messages they send to me are shown as not received.

There are moments however when proper communication operation gets reestablishes by itself. Then you see a bunch of messages coming in. But it doesn't last.

Other functions not working are:
* no settings changes are applied
* no contact resync works.