Dear Mats,
Thank you very much for sharing this! It seems to be a strange one
From my experience, it might happen due to the 3D camera was placed at an unfortunate angle, thus renders some weird artifacts while editing the morph. Could you help us to check whether this is the case?
Looking forward to hearing from you!
Best regards,
Minh
Minh Nguyen
Technical Support Engineer
GRAPHISOFT