rotobrush out of memory when played, but ok if forward frame by frame
When using rotobrush if I click play, it works for a second or two and then display an orange bar saying I need to free up some memory, and then just loop back a second or two making no more progress.
Quitting all other adobe apps allows this to procecss a little more frames, but eventually the orange bar still appear.
Going forward frame by frame (PgDn) works fine. It never runs out of memory. I just get tired pressing PgDn. Why would "play" run out of memory? It's just repeating frame by frame automatically.