ggplot2: theme_set, pdf export, and Illustrator having difficulties

I have a list of all theme elements stored as a theme that is evoked before plotting. However, I recently found that when I export to pdf and try to open in Adobe Illustrator, I get an error "Acrobat PDF File Format is having difficulties." I've also seen Illustrator report that it has "Too few operands." However, when I use a standard theme (say, theme_set(theme_gray())), there's no problem in Illustrator. Also, regardless of the theme, I don't have issues with plotting or saving modified figures.

Perhaps someone can suggest a) the best way to store and evoke large quantities of theme settings, and b) what could be the source of my ggplot2 -> pdf -> Illustrator woes.

Here is my current theme, how I evoke it, and a sample plot. Note that some of the parameters are commented out, serving as placeholders if I should need them later.

textc <- "grey20"
gridc <- "grey20"
backc <- "white"
fontsize <- 12

new_theme <- theme_set(theme_update(  
  #axis.title = element_text()
  axis.title.x = element_text(colour=textc,size=fontsize,angle=0,hjust=.5,vjust=.5,face="plain"),
  axis.title.y = element_text(colour=textc,size=fontsize,angle=90,hjust=.5,vjust=.5,face="plain"),

  #axis.text = element_text()
  axis.text.x = element_text(colour=textc,size=fontsize,angle=0,hjust=.5,vjust=1.5,face="plain"),
  axis.text.y = element_text(colour=textc,size=fontsize,angle=0,hjust=1,vjust=0,face="plain"),

  axis.ticks = element_line(colour=gridc, size=0.5, linetype="solid"),
  axis.ticks.length = unit(.25,'cm'),
  axis.ticks.margin = unit(.25,'cm'), 

  axis.line = element_line(colour=gridc, size=NA, linetype="solid"),
  #axis.line.x = element_line()
  #axis.line.y = element_line()

  legend.background = element_rect(colour=NA,fill=NA,size=NA,linetype="solid"), # removes title and legend
  legend.margin = unit(0,"cm"),
  legend.key = element_rect(colour=NA,fill=NA,size=NA,linetype="solid"),
  legend.key.size = unit(1, 'cm'), # spacing between entries
  #legend.key.height = unit(),
  legend.key.width = unit(1,'cm'),
  legend.text = element_text(colour=textc,size=fontsize,angle=0,hjust=0,vjust=0,face="plain"),
  #legend.title.align =  0,#between 0 and 1
  legend.title = element_text(colour=textc,size=fontsize,angle=0,hjust=0,vjust=0,face="plain"),
  #legend.title.align = 0,# between 0 and 1

  #legend.position = "right"
  #legend.direction = "horizonal"
  #legend.justification = "center"
  #legend.box = "horizontal  

  panel.background = element_rect(colour=NA,fill=NA,size=NA,linetype="solid"),
  panel.border = element_rect(colour=NA,fill=NA,size=NA,linetype="solid"),
  panel.margin = unit(c(0, 0, 0, 0),'cm'),
  #panel.grid = element_line()
  panel.grid.major = element_line(colour=gridc, size=.4, linetype="dashed"),
  panel.grid.minor = element_line(colour=gridc, size=.4, linetype="dashed"),
  panel.grid.minor.x = element_blank(),
  panel.grid.major.x = element_blank(),
  #  panel.grid.minor.y = element_blank(),
  #  panel.grid.major.y = element_blank(),

  plot.background = element_rect(colour=NA,fill=backc,size=NA,linetype="solid"),
  plot.title = element_text(colour=textc,size=16,angle=0,hjust=0,vjust=1,face="plain"),
  plot.margin = unit(c(.25, .25, .25, .25),'in') # top, right, bottom, left

  #strip.background = element_rect(colour=NA,fill=NA,size=NA,linetype=NA),
  #strip.text
  #strip.text.x = element_text(colour=textc,size=fontsize,angle=0,hjust=0,vjust=0,face="plain"),
  #strip.text.y = element_text(colour=textc,size=fontsize,angle=-90,hjust=0,vjust=0,face="plain")
))

theme_set(theme_gray())
theme_set(new_theme)
options(scipen=9999) # suppress scientific notation


d <- ggplot(mtcars,aes(x=wt,y=mpg))+
  stat_binhex()+
  scale_fill_gradientn(colours=c("darkorange2","red","black"),name = "Frequency",na.value=NA)
try(ggsave(plot=d,filename=<some file.pdf>,height=4,width=6))

SessionInfo():

R version 2.15.2 (2012-10-26)
Platform: x86_64-w64-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] grid      splines   stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] hexbin_1.26.0      lattice_0.20-10    reshape2_1.2.1     Hmisc_3.10-1       survival_2.36-14  
[6] plyr_1.7.1         RColorBrewer_1.0-5 ggplot2_0.9.2.1   

loaded via a namespace (and not attached):
 [1] cluster_1.14.3   colorspace_1.2-0 dichromat_1.2-4  digest_0.5.2     gtable_0.1.1    
 [6] labeling_0.1     MASS_7.3-22      memoise_0.1      munsell_0.4      proto_0.3-9.2   
[11] scales_0.2.2     stringr_0.6.1    tools_2.15.2

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