[jmole]

"image recitation block" means they are blocking generation of images that already exist in their database (training data).

[neksn]

Just to confirm, what this means is that the training data contains one or multiple pitch black images, and their system is refusing to reproduce them verbatim?

[jmole]

no insider knowledge here. my assumption is that the image hash matches a training data image. "all black" is a pretty easy hash to match.