[reedbook36]

    This happens every so often, and I can't figure out what setting is causing/fixing the issue.

I like to use Vertical Scrolling mode in portrait orientation so that I can see an entire page plus the first line or two of the next. I don't actually start the scrolling, instead turn with a pedal. Then one day (like today), I open a song and only see a black screen. I rotate to landscape and the music appears. Rotate back to portrait, black screen. Tap on screen, and menu items appear. Set to Single Page, and music appears. Change back to Vertical Scrolling, and it's gone again. 

Then, seemingly out of the blue (in another day), it will all work again. So what setting(s) should I check to keep this from happening. Yes, I could just use Single Page or Half Page, but I really like the other mode, which has worked well in the past. Thx