Training does not converge - black image

[krips89]

After a certain number of epochs, I am getting black image as output as shown in the image. The training seems to be converging in the beginning; however, it fails after a few epochs.

The losses also explodes during that time. Is this something known?

[krips89]

Update: I get this black images when I train with the split used in many of the previous works (PoseGan, Coordinate Based Inpainting, DensePose Transfer, Neural Human Re-Rendering).

However when I train with the split used in this project, it seems to converge fine.
Why was this new split introduced?
What could be a good explanation? So much instability with different splits?