Off the top of my head, do you have any other perl environment variables set? For example, PERLLIB, PERL5LIB, or the like?

I'm just guessing, as I don't use Oracle (I use DB2 ;-}), but perhaps Oracle is adding stuff to PERLLIB or PERL5LIB for some reason which I could guess at, but it wouldn't be good conversation if I did.

"Mucking with users' environment is highly discouraged." If only everyone understood this. ;-)