'whereis' checks only in the standard binary directories. 'which' checks the full path i believe.That seems to imply there is no racket at all and indeed "whereis racket"
is racket in /Applications/Racket v5.1/bin/?
didn't you forget the export in .bash_profile? export PATH=$PATH:/opt/local/bin:/Applications/Racket\ v5.1/bin/
