It does seem to fail the same way for the same operations. I'm trying to use a 6800 x 6800 gray scale map for the terrain and the same size texture map. The wire frame render option fails in the assembly room and it fails to render during final rendering. Maybe Im asking too much from C4, but it says it will do terrains up to 8193 pixels, but I get memory allocation errors at the setting. I would think 1 Gb of memory would be adequate, maybe not?