I did rename the open.ini and tried that, before I gave up. Result was the same.
Open cpn connect only the 1st time after start for approximately 3 seconds and then drop the connection. For me it appeared as if in the connection a time run out and than it's dropped.
I was searching in google
if I am the only one with problems in this type of connection, but I am not. In some other cases the pc of the people even crashed.
Also in the help it says clearly that a lot was changed with the connections.
My gateway showed very clearly that the com port is not opened!
In my opinion it has a general problem with the connection from open cpn side.
About the parallel installation
: my version is running fine now and I only need it as backup (had that before that chart plotter went "dead" with the touch screen).