Intermittent but persistent crash

[nimbleswitch]

Every few days since upgrading to iReal Pro for iOS7, I will touch a chart screen in Portrait intending to go to Edit, but instead of giving me the "Edit/Duplicate/etc." pop-up menu, all that happens is the chart suddenly gives me Landscape-sized chord symbols while I'm still in Portrait. So now I'm looking at only 5/8 of the chart's width. Turning my iPhone 4S sideways gives me a normal-looking Landscape, but turning it upright again continues to give me the 5/8-width chart in Portrait. When I then try to go to Edit, I get the Edit/Duplicate pop-up menu, but when I press Edit, I get a blank, black Edit screen that does nothing. I can still navigate around the app, but when I try to return to Edit again, I get the blank, black screen again. If I then try to navigate to Forums, when I press the globe-like icon, iReal Pro completely crashes and throws me out. If this happened more often, it would be really annoying. But it generally occurs perhaps 2 days to a week apart [But now see EDIT.], so . . . . Anyway it's been happening for months now. I THINK I have set it up so that you always get notified when it crashes, but I'm not sure of that. Anyway, FWIW. Doesn't make me want to stop using the app as infrequently as it happens.

EDIT: (2014-02-06) Suddenly the edit screen goes black like this much more frequently now -- 1 or 2 times an hour. Leaving the app and coming back in doesn't help - it has to crash to clear the problem. Usually repeatedly pressing the Forum globe icon is enough to make it crash. Then it works fine on restart. But occasionally it freezes and I can't navigate to the Forums icon at all, so a total iPhone shutdown is needed.