[Observium] Graphs stopped working

Hi there,

I was wondering if anyone's got an idea as to why graphs would suddenly stop working? (see attachment)

I hadn't updated anything or changed anything, the rrd's all have data in.

It's running off Centos 6.2

Any ideas on how to troubleshoot?

[cid:18152FC1-6ED1-47C0-8A4D-DC5CBEF4B7BF@mill-ny.com]