Thanks Alperen, for your reply. I do indeed have the Continuously Rasterize option enabled. However it doesn’t seem to help at all. The output is the same, whether or not I have CR checked or not. Whether the mask is animated or static seems to have no effect as well. I am simply drawing a rectangular mask on an Illustrator layer, in AE, so am quite unsure why this is causing the rasterization on this layer only (despite being a ‘supported feature’). Any ideas? Thanks!
Mike