   D3D Fades Colors When Scrolling?
  Hi,I am updating my isometric tile engine from DirectX 6.1 to DirectX 8.1 and have encountered a problem I can't figure out even with the debug runtime.It displays the tile grid just fine if I don't scroll.  Color is set to full intensity white.  The background is black for now (didn't get to textures yet).  However, scrolling in any direction causes the grid's color to darken to a medium gray.  When I tried other colors, like full red, green and blue individually, the same effect occurs: they display fine when not scrolling, but darken when scrolling.I suspected alpha blending, but whether I turn it on or off it behaves the same way.  It happens to use the X8R8G8B8 display mode whether in windowed or fullscreen mode.  It behaves the same in either mode.  For the heck of it I tried playing with alpha testing, which only confused matters.  Alpha ref is set to 1 and the function is set to greater than or equal to, so only black should not appear: but my white grid does not appear when I enable alpha testing?!  Again, same effect in both windowed and fullscreen modes.Again, I appreciate any help, thanks!   