Ongoing Bug - Fade in a graphic with Alpha channel via Cross dissolve randomly creates artifacts
Cross Dissolve Bug. Been there for about 5 versions now.
Take an element with or without an alpha, add a mask, or not, then apply cross dissolve to fade it in. Randomly it will show a black zone over the graphic during the fade. Bug workaround is to keyframe opacity. Test this and you will find a repeatable bug. IF it doesnt do it on your first test, try again with a different element, it will eventually show up.