I am not sure if mine is the same problem.
I had a sim attend university. All the paintings he painted there were blank when he painted them but okay when he hung them in the dorm. I move him back into a house along with the paintings. They all turned blank, when he moved in and I put them on the wall.
I then had him, paint from reference, at Innisgreen. The canvas remained blank when he was painting but when I took him home and hung it on the wall it was okay. I later went to play another family and when I came back to play my painter sim's lot, the canvas was blank again.
I had him paint some, paintings by reference, while on his own lot. The painted up fine, not blank, while painting. I hung them up and went to play another family. Same thing happened again. All, paint by reference, paintings were blank.
He has painted other regular paintings, while on lot and those have all been fine. Not balank while he painted and not blank when I returned to play the lot. There was even a painting, that was painted by a sim visiting the lot and that one was fine too. I haven't had him paint regular painting off lot and being them home yet.
On PC. latest patch. Never any mods. Never any CC. All packs, except some kits.
