weird stuff happening - openCPN 5.5.1109 on OpenPlotter and Buster rpi 3 B+

[verkerkbr]

Ok, new experiments.

If I unplug the USB input and use just the wifi input from the Quark, all works well.

I refresh the Serial page in Signal K and remove the missing device. There is still showing there one device on USB port af21504 ttyS0    don't know what that is as it doesn't change if I move the USB dongle or change it or add a different one.

So then I plug in the USB cable and refresh. It now detects the quark input. I give it an alias and do a system check. All looks good.

I then go over to OpenCPN and add the new Signal K connection, local host, port 3000

Then I go back over to Serial Connections where I add the new connection that it discovered.

So now there is data coming in to the OpenCPN, but immediately the boat starts spinning around and occasionally disappears totally (although the dashed header line remains). And then every minute or so I get a warning

assertion failed something about settimeDateformat or something.

and then the mouse freezes again and I have to do a hard reboot.

If I then reboot, switch the connection in OpenCPN back to the wifi network, then everything is fine again, even though the USB is still plugged in, and the connections are still in the Serial app.

If I then disable the wifi input, and add a direct serial usb input in OpenCPN (not a signal k input) then everything is happy again, except for the warning from openPlotter that my default openCPN connection is not receiving data from Signal K.

So obviously there is something odd going on with the USB input through Signal K. Any ideas?

At least I can navigate by bypassing the Signal K, so it is not desperate! And at this time I have not other inputs to Signal K, so I guess I don't really need that feature.

I had some issues with the automatic searching for the server address in OpenCPN. Switch it to off. It is not needed if you indicated localhost as the server adress.