R.app Editor

Hi all

I need your help. I am writing code in the editor window for R.app,  
but when I write something like a^ (not sure of the correct technical  
term) the application hangs, and I can't write anymore. It's happening  
only with the symbol ^

Thanks,

Angel

R.version

platform       powerpc-apple-darwin8.11.1
arch           powerpc
os             darwin8.11.1
system         powerpc, darwin8.11.1
status
major          2
minor          8.1
year           2008
month          12
day            22
svn rev        47281
language       R
version.string R version 2.8.1 (2008-12-22)