P6 has a well hashed over and more than well dicussed and b*tched about Memory Bug. CL is aware of it and is working on it. The current solution is to reduce texture sizes and reduce the bucket size (manual settings for rendering). It also does not matter how much memory one has. I've got 512MB and I've only ever encountered it once. Others with 2GB have encountered it numerous times. Some, have never seen it at all.