Not sure if anyone know or just not many read the OpenGL post. Haven't found anyone who has knowledge about this problem so far. http://www.gamedev.net/community/forums/topic.asp?topic_id=569491 Anyway, looks like to me that the window must be the main thread or other graphic render functions have to be directly under the window thread; otherwise, nothing would be drawn at all on the screen. Any one knows a way to work around or we should just stick it, just keep the window as the main thread? Thanks. [Edited by - phantom on April 28, 2010 6:32:04 PM]