Yeah, just found that one myself - I needed to edit the /etc/preinit.d/M30emptriv so that it looked like:

#!/bin/bash
cd /programs0/emptriv
/programs0/emptriv/emptriv


This will start emptriv from it's own directory so that it can find it's font file. I've made the change to my script - attached. If you remove the /etc/preinit.d directory, it'll get recreated correctly when you rerun the script.