I had the bump cranked up when I was trying to debug the problem. I just tried taking it down to make sure it isn't the cause and it looks like it doesn't effect it. Basically, for me, clicking "seamlessly" for a tiled texture map in the bump channel doesn't seem to do anything. It does work in the color channel. Haven't experimented with other channels. I recently installed the 'fishnet' shader plugin and may uninstall to see if that is the problem. I'm not using it in the shader but who knows. Thanks for the warning about bump >100%, though. I'll keep it in mind. And it was worth checking to see if that was the issue ;-). Marc