I think there maybe something buggy with the Window> Overlays Panel in InDesign CC 2015.
I had my last update about 29 days ago and it seemed to look OK before that.
However now if you try to select one other the items like video or audio the text and fields in the panel "overlays" themselves so I can't choose options.
I wonder if anyone else is having this issue?
Maybe Adobe can fix it on the next update?
Moved to AEM Mobile forum.