Hi, I have a strange problem with my device resetting.... I have a skybox, consisting of 6 textures and a VB. When I start the app, either fullscreen or windowed, the skybox is visible. After switching windowed mode, it is no longer visible. I have checked the pointers after the switch and they are valid. I have tried created D3DPOOL_MANAGED resources, and even tried manually releasing and recreating around the device reset but to no avail. Can anyone suggest what I might try next? I am stumped! Thanks Simon