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Originally Posted by davidfor
Kobo hasn't had an official invert mode. There is developer option to turn it on. And a separate hack to do it. But, if you have never used it, then it isn't the problem.
Something like that could be sign that an updated didn't happen properly. Manually putting the firmware update on the device can fix things like this. Or, in the extreme, doing a factory reset.
Otherwise, it could timing. You are opening the cover at exactly the wrong time so that the device is changing state and gets into some sort of confused state. I don't know exactly what, but, that it goes away when you close and reopen the cover suggests something like that.
It could also be the book, or the cover image generated for it. I've had a couple of books with a cover image that triggered a different method for updating the screen when going to sleep. Which also caused some interesting affects when the device woke. Replacing the cover in the book solved this.
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I don't *think* it's a cover image, as it's happened too many times on different covers over the past year. It just seems to be worse lately. But I'll try replacing a cover next time it does that on a cover instead of a homescreen or library screen.
Anyway, appreciate your thoughts and I may try a factory reset. It's not a big deal, as my books are in Calibre and I don't tend to keep a lot of books on the device. I load, read through, load more with occasional turning on of the WiFi to fetch a library lend. I don't patch, so it's stock Kobo.
This gives me some hope! Although I'm looking forward to trying the Forma, I've been feeling sad thinking the Aura One might be on its last legs.