I am having the same issues as reported here.
Viewing plex pictures on an Ipad air 4 running ios 15.3, after viewing several images (random number, but up to 20 at most) the photos library stop loading photos and I can only see a blurry image. I have to go back out of the app and back in again to get things working.
Not sure if it’s relevant, but photos and videos are stored in different folder structure with same names so that both videos and photos appear in the same folder/photo albulm when viewed Plex.
Just downloaded the Plex update for the iPad 7.28 and the QNAP Plex server update 1.25.4.5487. Still having this issue. Once an image does not load, leading just to a blurry background, if I scroll back to previous photos that showed correctly, they will now only show the blurry background.
At the moment, what with no single Plex Home Move playing on the Shield due to a bad update, and not being able to view a photo album on my Ipad, there is no media consumption device that currently works with plex, meaning I have to view the images on a computer.