The following is a plot that used to work (last December, I think with  
a patched version of ggplot2 from Hadley), but has stopped working  
with recent updates.  Other instances of facet_grid work and the data  
look normal to me.  Since I have no idea what caused the error  
message, I'm having trouble producing a reproducible example or  
solving the problem.  Has anyone seen this before?

Many thanks,
Jacob Etches


 > p <-     qplot(year,prop.excl,data=subset(excl,!is.na(ftf) &  
exclusion %in%          
c("disab_inc_rec","family_death","fs_ch","ft2_ch","retir_inc_rec")),
     	geom=c("line"), colour=Exclusion,
       ylab="Proportion of persons per exposure year",xlab="Start year  
of exposure window")
 > p+ facet_grid(ftf + Sex ~ Age)
Error in rbind(c("spacer", "strip_h", "strip_h", "strip_h",  
"strip_h",  :
   number of columns of matrices must match (see arg 2)
In addition: Warning message:
In rbind(list(1, 1, 1, 1, 1, 1), list(0.77705, 1, 1, 1, 1,  
0.545041666666667,  :
   number of columns of result is not a multiple of vector length (arg  
1)



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