I've got a Windows/OpenGL app that uses depth textures to implement shadow maps. All is well on other graphcis cards but on ATI cards I get holes in the shadow maps at resolutions greater than 128 x 128.
It seems to be worse on 64 bit systems but I can't say that reliably. All ATI cards tested have the behavior to some extent. I've tried several driver versions and am currently running driver version 8.712.3.0 (it came with Catalyst 10.3).
Anyone else seeing something similar?