Thank you for this informative reply. It’s nice to know this program is still a work-in-progress.

In a past life I worked as a software designer (even had a stint with AutoCad) so explanations like this I find very interesting.

Can you direct me to that area where the discussions you mention were voiced? I’m curious to know more about that issue.

From: LordOfBikes [via LibreCAD] [mailto:[hidden email]]
Sent: Monday, December 28, 2020 1:25 AM
To: JR
Subject: Re: Layer list

There are already some discussions about this here and on github.
The problem is, that the LibreCAD undo/redo system keeps layer names on undo, in case you use redo.
So I assume you added a layer, then used undo, what removed the layer from the list and then tried to add a layer with the same name again. This doesn't work.
But when you close the file and reopen it, the undo/redo system for the file is reset and it is possible to add a layer with the same name as before.