Thanks for the reply.
The output of which cutadapt is: /local/software/python/2.7.5/bin/cutadapt
and echo $PATH gives:
/local/software/python/2.7.5/bin/:/usr/lib64/qt-3.3/bin:/local/software/moab/default/sbin:/local/software/moab/default/bin:/local/software/torque/default/sbin:/local/software/torque/default/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/lpp/mmfs/bin
From that, neither version is in my PATH. So would I need to put 1.9 into my PATH for it to work?