There was this bug reported early this year with no updates. I never knew about it until I saw something similar happen the past couple of days, and I've just heard a private report and seen a post across the street from another person having it happen recently across every alpha-masking surface on his sim. Hence, if you notice some alpha textures spontaneously switched to mode "None" and they stay that way across login sessions, don't panic. Or, go ahead and panic, but at least you know you'r