Already happen to me:
- SS: Some images with that rejection. I've upload them again without any problem and all got accepted. By other side, as I said in another topic, had a entire batch stuck there, and the solution was delete all images and upload them again. Some weeks ago I've notice that a bunch of duplicated images appear online on my port...
Sporadically, got some images with upload error on: SF, YAY, BS ( notice when opening them for keyword editing ), but they are a "special" section.