I’ve noticed this happening sometimes. I’ll create a Select List, and populate it with my selections. If I move it around, once in a while the list gets cleared out, as well as the header text (the bold/black text on the left) defaults back to “Menu Label”.
I hit ^Z to bring it back, but it’s a little disconcerting at times to suddenly have my items disappear!
(Is there a Bug report area this should go in?)
Patrick