FWIW, http://jopr.org/confluence/display/JOPR2/Installation is better install docs than that first link you gave.
This may be caused by different behavior in Postgres 8.4 (I am not sure how much testing was performed on 8.4 on a different locales - most people are still on 8.3 I think).
Can you create you DB like that page you pointed to describes:
initdb -D /my/test/data -E SQL_ASCII --locale en_US.UTF-8
then re-install/re-run the installer and see if that fixes it?