The lvleditor have a small glitch involving a strange behavior of opening Quest
Log without necessity.

Start the level editor. Click to playtest, immediate regret, so while it loads
(or maybe as soon as it loads) press ESC to open the menu.
Return to Level Editor. You'll see the quest log blink, and the level editor
will not work properly because you've forgot Quest Log open - you must make a
new playtest and close the Quest Log. THEN you can resume editing.

I do not think this error happens again at second attempt to playtest. May be
related to sanitizing. A truly minor lvledit bug.