pyForum can't post

Hi,

Been trying out piratebox have it up and running on a few C.H.I.P. computers (sorry raspi section but nothing for CHIP)

I've been trying to get the pyForum "forest" going, I've run

/opt/piratebox/bin/install_piratebox.sh /opt/piratebox/conf/piratebox.conf pyForum

and I can reach the forum at: piratebox.lan/cgi-bin/forest.py

But when I try to create a new thread it never works out
after creating the post and submitting the new thread I get forwarded to a blank page
at: piratebox.lan/cgi-bin/forest.py?new=thread

and when I go back to piratebox.lan/cgi-bin/forest.py no new thread.

any advice would be greatly appreciated