Light Tracer + Bump Map?

[Lev]

We are experiencing weird artifacting problems when using Light Tracer with tiling bump maps (like carpet, and other large flat surfaces) It seems that supersampling and texture filtering does not work correctly when rendering bump mapped surface with light tracer. Instead of a smooth, perspectively blending pattern, the renderer produces sharp black lines where the bump-mapped indents should be. ( You can see a mild example of such artifacting on one of our gallery screenshots at www.eccentrix.com/members/z80180/index.htm - look at the last two robot pictures) Inecreasing quality settings didnt help much.
Have anyone else experienced this or knows how to fix the problem?