We were at WDW August 7 - 14, and I was anticipating issues based on recent experiences with Disney tech side overall. However, we really did not experience any real problems (occasional glitches, but small).
I know for a fact we could view all dining credits on the app, because, frankly, my husband was a wee bit obsessed with using up all of those dang snack credits LOL I wish I could tell you exactly how we could view the dining credits (I think it was under our hotel area), but as with some many features of the app, that is not viewable once you leave property.
I do wonder if this is a platform/browser issue to some degree. There were 5 of us n our family group, and we all had phones, but not an Apple in the group.