Hello Jerker, Roland,
Thank you for your replies.
Before launching an older version, I went back to the export to trainz vector data window.
Why? Well Roland, in your answer, you wrote ... erase the settings altogether.
In the export to trainz vector data window, I had never used the button reset before.
There were only a few kuids I had added, so let me see what the reset button does.
And yes, just by clicking on the reset button, only the kuids -1:100673 and 523:15523 are left in the list. All others are disappeared.
However, this doesn't mean, that you did a permanent deletion of the list. When you close down the export to trainz vector data window, and reopen it, the total list ( in my case with the error in the description box ) is back again.
Best regards
Kurt