I hope you are not going to burn DVD Video compliant material on those discs - you should get DVD +R DL media for that task.
Your issue is that the burner doesn't like the media/brand of those discs.
Princo was crap media when I used it in 2003/2004 and I would recommend you to get some decent ones. like Verbatim.
I'm the lazy one, so I always edit that field after I've pressed the Build icon and when the program suggests it for me and that label window shows up first after I've press the Build icon.
Perhaps if you add a folder that contains a DVD Movie / Blu ray compliant structure it could be showed a name in that box at an earlier stage or have some type of icon that fills the rows based on the folder/files you have added in such a case? But the current new tweaking is enough for me.
So after this new "tweaking" and if I have a folder named "Minnie Mouse" (and it contains a VIDEO_TS folder) - will it now suggest a "saving name" in the Destination save box/window that pop ups when I leave the Destination "naming of the iso row" empty and press "the build icon"?
Currently the the Destination save box/window is always empty, like this one.
Spara som = Save as
Filnamn = File name