If there is a picon folder then it won't download them. Is the hdd initialised?I'm still not getting picons for some reason. I am using portable hdd which I have checked is mounted as /media/hdd Device /dev/sda1. Maybe the portable hdd is the issue. I tried both with no picon folder and also created the folder first and rebooted.
If the hdd is initialised and mounted without a picon folder it should download when the box reboots.