It's possible that Kobo readers are touchy about the exif data for images. I don't read cbr or cbz on my readers, but it's a definite issue viewing images that are rotated say on your TV afterwards, etc. It's possible you simply need to get a program that will allow you to change the orientation in the exif info after you've rotated it, then zip it back up and see if that works.
An easy to use older one that still runs even on Windows 10 that I use is PhotoME.
Edit: Another one that's easy to use is Exif Pilot Editor.
Last edited by Ripplinger; 12-14-2017 at 01:17 PM.
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