The problem for me has been that it is so often not unusable. There is a quirk in the interface whereby you can't minimize the keypad after you enter the pump number, and the "confirm" button is therefore hidden behind the on-screen keypad. Every once in a while after an update the display will change so you can catch a small sliver of blue to tap to confirm, but then a subsequent update will revert it back to what it's again doing now: you can't tap the confirm button to activate the pump. I don't know if it's fully an app layout problem or at least partly an Apple interface problem, but I've tried all combinations of zooming the text, changing the display size, tipping the phone, etc., and nothing fixes it. What's truly mystifying to me is that I don't see anybody else in the reviews complaining about it, yet for me it renders the app completely unusable. I can't possibly be the only one having this issue, can I?
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