I saved a scene file in $HOME/a/b/c/d on the first saved of the scene. I also saved along with all the scene file all associated data files in the same directory.

If I modify the scene or add new data the next time I go to save the default directory is

$HOME/a/b/c

After another change and save the default directory is

$HOME/a/b

It appears that every time the default directory for the .mrml file increases one level in the hierarchy. This is particularly confusing when I go back to find my scene file and the original $HOME/a/b/c/d directory does not contain the most recent scene file.

My expectation would be that the each successive save would overwrite the existing scene file unless I specified a new file name or location.

Tested with binary download of 4.3.1 on linux.