[R] Factors in lattice

[Phil]

Using one numeric and 2 factor variables

densityplot( ~ Numeric | Factor1, ...)
densityplot( ~ Numeric | Factor2, ...)

 .. both work, but

densityplot( ~ Numeric | Factor1*Factor2, ...)

produces the error

Error in if (!(lo <- min(hi, IQR(x)/1.34))) (lo <- hi) || (lo <- abs(x[1]))
||  : 
        missing value where logical needed

None of the variables contain missing values. Any ideas what I'm doing
wrong??!!

Many thanks

Phil.

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