If you have compiled proftpd from source then you should recompile it using the following switch with configure:
./configure --localstatedir=/var
If you don't want to recompile you'll have to use:
ftpwho -p /scoreboardpath
The simplest solution would be to add the following command to your .bash_profile file:
alias ftpwho='ftpwho -p /scoreboardpath'
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