Back then reuploading was the only fix.
I have got the same problem again on a different install. On iPhone and iPad images turn when they are corrected with the editing options in the library. On this website are a lot of editors who can upload there own galleries so it would be very unfortunate if a lot of those images are up side down on mobile devices.
It’s not a plugin conflict, but maybe something with safari?
Can you guys test this out?
Best,
Kirsten