Quote:
Originally Posted by hobnail
The invisible button was due to its color mapping to a grayscale value that was very close to the grayscale value of the background.
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I've experienced that issue a number of times. Until I can optimize such apps so that they will work well with an eink screen, what I usually now do is open the app up on a tablet or a phone while I am setting it up on my ereader. That way, I can see where the "invisible" buttons are "hidden". Once I've adjusted an app's visual settings to work well on my ereader, I no longer need to have it open on a phone or a tablet.