I have a Macbook Intel Core 2 Duo 2.16 GHz, 2 GB 667 MHz DDR2 SDRAM, 120 GB Hard drive, and Mac OS 10.5 Leopard. I bought this game while I had Tiger and it worked fine, but I don't believe I have played it since Leopard. When it starts up it looks normal, but when I load a neighborhood, all the terrain is flashing red, when a house loads there is no lighting and is almost completely dark. I have turned off optimize rendering to no avail. Any help?