audio issues since last update of JamKazam Mac client - looking for help

[Giancarlo]

>>>
Thank you Dimitri. Answers, as far as I can undersand the question, in Blue.
I am not very proficient in theses things.

Giancarlo, just making sure here, do you have your WiFi turned OFF on the machine you're using?
YES

Does your machine have only one IP-address on your LAN?
What do you mean by "one" IP-address?
The OS IPv4 setting is <DHCP>. Should I change this to <DHCP with manual address>?

Did you try to use fixed UDP ports for jkz?
Yes. In the router settings I have set a port clearence for jkz for the machine I am using.

Did you try a fixed portrange forwarded to the wired IP of the machine you are using?
Yes. In the port clearance I have set a fixed portrange of 12021 - 12041. The router has auto-filled a IPv4-address of 46.22.17.188 for jkz.

I do assume UPnP is activated in your router?
Yes.

Firewalls turned off or at least granted I/O for jkz?
Yes.

I'm running latest (ofcourse   ) jkz on latest Catalina MBP and do not recognise these issues at all.
I am running OSX 10.8.5 on late 2009 MBP.

At last resort, did you try a 'fresh' reinstall? (so, also remove the jkz folder under your username in OSX)
Not yet. I guess I would have to delete also the .ini?