Filtered texture sampler doesn't do tiling (3ds Max 2012)

[Zoltan]

I'm using filtered texture sampling (as seen in texture_lookup_filtered.msl)
with MentalRay in Max 2012 (SP1). Beyond the border of the 0..1 UV space I
get black instead of a repeating texture. What's going on? Should I explicitly set
texture addressing mode somehow?

[Zoltan]

A frac(tex_coords) fixes it but it's not very elegant.