I have noticed an issue with the device filesystems graphs : they do not display correctly in widescreen mode.
The RRD command/debug says : RRDTool Output: ERROR: Legend too long But if I paste the actual rrd command in the terminal, it runs fine and the output graph is correct too.
It seems to be only happening with the filesystems usage graphs.
I think something similar was reported on Jira but it didn't went far : http://jira.observium.org/browse/OBSERVIUM-1248
You can find attached screenshots of the issue.
For the record I am using :
Observium CE
0.15.6.6430
OS
Linux 2.6.32-358.14.1.el6.x86_64 [amd64] (CentOS 6.2)