find /usr/tmp/* -type s -exec /bin/rm {} \; /bin/rm /tmp/pvm* /bin/rm /usr/tmp/pvm*
ls $PVM_ROOT/bin/$PVM_ARCH/the list should contain your program as well. If it doesn't, then pvm will not be able to spawn tasks.
If you want to keep all executables in one directory, say ~/bin, then the following trick is an elegant way out:
ln -s $PVM_ROOT/bin/$PVM_ARCH ~/binNow, ls $PVM_ROOT/bin/$PVM_ARCH/ and ls ~/bin will produce the same lists.