Hello,
i have a big problem. 
I'm upgrading since weeks my source from dx8 to dx9, but textures are transparent and I don't know why. I am using compressed textures (DXT1, DXT3 and DXT5)
All functions got updated to dx9, vertex version is 1.1 and pixel is 1.4.

DX8:

DX9:

Use Pix for DX 9 and examine the device states before rendering to see if alpha testing or blending is accidentally left on by a previous step.