[Observium] Real-time graphs not handling much about 1gbps (64-bit problem?)

Hi all,

I'm running community edition v0.13.10.4585 and polling a few C6500's and a Cisco Nexus 7k. I have a number of 10GE interfaces and 10GE etherchannel bundles. The 5 minute graphing appears to work fine, the numbers are accurate when I compare against another monitoring system in production. However, when I run a "real time" poll against an interface or port-channel, of any duration (2 secs to 60 secs), the numbers never crack much above 1gbps, and there are often negative numbers. This suggests 64-bit counters are not being used or being interpreted correctly, but I haven't looked at the code.

Has anyone else seen this? If so, did I mess something up with the install or is there something I can do?

Thanks,

-- Stephen