[R] Error with strwidth after lattice graphic drawn

[Frank E Harrell Jr]

In
platform i386-pc-linux-gnu
arch     i386
os       linux-gnu
system   i386, linux-gnu
status
major    2
minor    0.1
year     2004
month    11
day      15
language R
I'm getting an error when using strwidth after a lattice graphic is drawn:
library(lattice)
xyplot(runif(20) ~ runif(20))
strwidth('xxx')
Error in strwidth("xxx") : invalid graphics state
Any help appreciated.  I have version 2.0.1 of grid and version 0.10-14 
of lattice.
--
Frank E Harrell Jr   Professor and Chair           School of Medicine
                     Department of Biostatistics   Vanderbilt University

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