[R] Uninstalling RAqua (Mac OSX)

[Gonçalo Ferraz]

I wrote some R code that runs just fine on a friend's RAqua (MacOSX) 
but will never run on mine. This made me think there could have been a 
problem with my installation or version, so I went to
http://cran.r-project.org/bin/macosx/
and downloaded the RAqua.dmg file (version 1.8.1)
I upgraded RAqua by installing all four packages - but the problem 
persists. Would it help to uninstall completely before installing the 
new version?
How does one uninstall RAqua completely? I see there are files in my 
applications folder and in usr/local/bin... Should it be enough to 
remove those files? I tried that too, and again, the problem persists?
Any help will be greatly appreciated.
Best,
Goncalo