I found after following the instructions that when

/opt/observium/poller-wrapper.py

was run from cron it was failing… also needed

apt-get install python-mysqldb

From: Alberto Moreno Ramirez <Alberto.Moreno@ie.edu>
Reply-To: Observium <observium@observium.org>
Date: Friday, 12 July 2013 6:58 PM
To: Observium <observium@observium.org>
Subject: [Observium] observium doesn´t paint graph

Hi, I´m a beginner with observium. I have been working with cacti but Observium is more complete, I thing

I have installed Observium with several devices: One network, One firewall and one server. It collects data very well but Observium doesn´t paint (not look) any graph.

Even Real Time graphs work perfectly but the other graphs not