Hang with help link to pdf overview file

A post to r-help today prompted me to see if I could reproduce the  
problems the poster was having with a hang as a result of access to a  
pdf vignette for package zoo. I was not able to get a hang with using  
(from the GUI):
vignette("zoo")
but I was able to get a hang when access the zoo help Index and  
choosing the "overview" link at the top of the help browser page. The  
OP was using R 2.11.1, while I was using R 2.10.1. We both were using  
OSX 10.5.8.

I then updated to yesterdays stable  R 2.11.1 from the ATT page and  
can still get the segfault, although it no longer hangs. It lets me  
exit gracefully and even lets me copy portions of the console window:

 > ?zoo
starting httpd help server ... done

  *** caught segfault ***
address 0x101e90000, cause 'memory not mapped'

Possible actions:
1: abort (with core dump, if enabled)
2: normal R exit
3: exit R without saving workspace
4: exit R saving workspace
 >
Selection:

The original r 2.10.1 setup ....

 > sessionInfo()
R version 2.10.1 RC (2009-12-09 r50695)
x86_64-apple-darwin9.8.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

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

other attached packages:
[1] zoo_1.6-3      lattice_0.18-3

loaded via a namespace (and not attached):
[1] grid_2.10.1  tools_2.10.1

The error report from R 2.10.1 is available if anyone is interested.