   noob question: Crazy Flashing Colours
  Hey all,Im working from a book I picked up that uses DX8.1 and thus is what I''ve been using for the moment. Everytime I run any code that puts something on the screen I get crazy flashing colours over the top. One of the exs I did but a bitmap on screen, and I only got the crazy flashing over the bottom half.Does anyone know what is causing this problem? 
  Are you clearing the backbuffer?example:g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,255), 1.0f, 0 );;  Yea, the back buffer is being cleared right before I call present()Meh, I tried it on another computer and it all works fine. I also have a feeling that the demo game on the book's CD did work fine on my PC a while ago.Do you think there could have been some display stuff changed since then that would be screwing around with it?   [edited by - neXt on December 19, 2003 3:50:08 AM]