Sometimes there are some lines in parallel in my videos and Proteus (v3) tries to merge them together, which results in weird artefacts, because its just for a specific area 
See the sofa at the back: (left original 576p, right upscaled 1080p parameters set to Auto)
UPDATE: sorry, my fault. The reason behind this is Themis. Both V1 and V2 both merge them, but in a slightly different result.
