Black pixel squares comes and goes

[Pticrix-1186]

Black box textures/animations in some acts

Large black textures flashing really fast. Started act 2 where the boundaries of the map are. In act 4 much more severe, usually where dead monster are on the ground. It blinks a lot and makes impossible to see what is happening.

Let’s make this one thread huge, so we can have more traction. This bug is really problematic in Act IV