also, some textures apply the bump map to the gradient bump channel not the bump channel in the materials room. Make sure it is attached to the bump channel, then experiment with the settings to achieve the best result. In P6, you need to turn the bump channel down to below .1 to get decent most of the time.

Humankind has not woven the web of life. We are but one thread within it.
Whatever we do to the web, we do to ourselves. All things are bound together.
All things connect......Chief Seattle, 1854