I've solved this, so for anyone else having the same problem the solution is simple: edit
/etc/rc.d/StageD_PreMfs/rc_Sequence_255.Hacks.sh; change the line that reads
$TM -l /var/log/ticketmaster.log & to
$TM -m -M XXX -l /var/log/ticketmaster.log & (where XXX is your MAK), and restart the TiVo.
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