Animation is essentially a wee hop. Every so often after some persistence a photo will open. Selecting never works.
FYI I'm not a novice so cache cleaned, full restart etc. Still no improvement. More interested in folk who have the same issue and if there's a specific resolution tbh. Thanks anyway...
I deleted the data in the gallery app. I then restarted. It does muck up your folders a bit, but photos are unaltered. You also have to reset Gallery Labs if you use that.
Yes. As described above. Delete the personalised data in app info. You then need to reset folders a bit and restart labs (if used), but it clears the fault.
All photos remain. I hope you have them backed up elsewhere anyway.
Folders are a bit of a hit and miss with new ones created, but I was back to where I was with limited sorting. Well worth the effort as opposed to the glitched state.