Messages are moved here (should anyone ever want to see them again) once they are no longer applicable to the current version (e.g. suggestions that have been implemented or bugs that have been fixed).
I tried to load a new dungeon, and it asked if I wanted to save the changes from my old one. I clicked "Cancel," to cancel the load, and it went ahead and loaded the new dungeon anyway.
I've tried doing this and "cancel", cancels the load (and "no" doesn't save the old dungeon and proceeds with loading the new one). I think I must be doing something different to you! Can you let me know exactly what sequence of options / buttons you selected and I'll take another look.
I made a change to the dungeon, and then clicked one of the recent files (just below "Save As")-- I then clicked "Cancel" when the box popped up, and it went ahead and loaded the new dungeon anyway.