[smw]

I had all overlays and nav bars hidden...there were just narrow black zones along the left and right (portrait mode) which didn't make sense. Whatever the case, it stopped doing it. I wonder if it was just may tablet glitching.

I have what seems to be the same problem.  In my case the narrower-than-it-should-be presentation occurs entirely at random, whether or not the overlay is displayed (and whether or not the audio player is displayed).

This has been happening for some time now (since at least mid-November, if not earlier), and through at least the last three versions of MobileSheets Pro.

I haven't seen any consistency in which pages exhibit the problem and which don't, nor in when the problem happens and when it doesn't; I've seen it disappear and recur many times, sometimes with the recurrence on the same page that was displayed incorrectly and sometimes on pages which had been displayed properly.  Restarting the tablet sometimes cures it temporarily, as does restarting MobileSheets.  In fact, at least twice I thought that an update had fixed the problem, only to have it recur later.

The fact that the display is a small bit narrower than it should be is trivial, but the fact that it causes annotations to be displayed in the wrong place is more serious.  I'll be really happy to see a fix for this!