Hey there,
I had the same problem. But it only occurred in the native android viewer. The iOS version worked as it should.
I had a 2 state MSO, 1st state an empty box, 2nd state a full screen HTML overlay (image gallery).
Sitting on top of the HTML overlay were some 'instructions' ('SWIPE THROUGH GALLERY', and a 'CLOSE' button.)
To make sure the 'SWIPE THROUGH GALLERY' instructions stayed on top of the HTML overlay it had a button action on it... 'Go to state 2' (same state it was on).
The 'CLOSE' button went to the first state.
Only thing that worked was the HTML. It seemed to overide all the DPS functionality, but you were still able to see the instructions.
I tried adding a button outside the MSO on a top layer that would close the MSO but that didn't work either.
Hmmmmmm...
