Well perhaps we can take the mystery of why it work for me, but not you, off
line :-)
I'm using R 2.6.1 on a WinXP platform. 

You could try just using shades of color like this:

data(HairEyeColor)
a <- as.table( apply(HairEyeColor, c(1,2), sum) )
a1<-a[1:2,]

barplot(a1,
        type="n",
        col=c("red","pink","blue","lightblue","purple",
              "lavender","green","lightgreen"),
        beside = TRUE )




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