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I found a javascript issue with the app while testing page loading speed. They came straight back with a fix. None of the usual "it must be a conflict with another app" or "it must beyour theme". A simple - yes that was at our side and it is fixed. Brilliant. What you want from an app developer. Clarity and honesty. BTW they fixed it within the hour and it wasn't even a critical issue. Just some errant js.