> > -mime:image/*
> 
> You might try "-mime:image/*" just in case there is
> a shell interaction.

Thanks for the suggestion, but unfortunately that yields the same results.

$ httrack -%H <http://www.cs.utah.edu/~gk/atwork/> "-mime:image/*"

$ find www.cs.utah.edu/
www.cs.utah.edu/
www.cs.utah.edu/_gk
www.cs.utah.edu/_gk/atwork
www.cs.utah.edu/_gk/atwork/img
www.cs.utah.edu/_gk/atwork/img/steamshovel2.10.delayed
www.cs.utah.edu/_gk/atwork/img/bearwithus2.9.delayed
www.cs.utah.edu/_gk/atwork/img/weetriangle2.d.delayed
www.cs.utah.edu/_gk/atwork/img/thinstripes2.14.delayed
www.cs.utah.edu/_gk/atwork/img/caffeine2.b.delayed
www.cs.utah.edu/_gk/atwork/img/hevequip2.c.delayed
www.cs.utah.edu/_gk/atwork/img/bigtriangle2.6.delayed
www.cs.utah.edu/_gk/atwork/img/dumptruck2.a.delayed
www.cs.utah.edu/_gk/atwork/img/sqrman2.e.delayed
www.cs.utah.edu/_gk/atwork/img/legocrane2.8.delayed
www.cs.utah.edu/_gk/atwork/img/bevelbar2.0.delayed
www.cs.utah.edu/_gk/atwork/img/fancy2.13.delayed
www.cs.utah.edu/_gk/atwork/img/bangsign2.f.delayed
www.cs.utah.edu/_gk/atwork/img/chicagosign2.7.delayed
www.cs.utah.edu/_gk/atwork/img/tools32.12.delayed
www.cs.utah.edu/_gk/atwork/img/roadblock2.11.delayed