[Observium] Monthly Thumbnails not Updating

It appears that my monthly graph thumbnails are not updating, but when I go into view the RRD from a monthly perspective the data is there. Check out the attached screen-shots to better explain the issue. I'm currently running the non subscription version.

https://www.dropbox.com/s/mifk9lm9yp40ebh/Screen%20Shot%202014-03-27%20at%2 010.22.47%20AM.png

https://www.dropbox.com/s/02teszwfy8rhfml/Screen%20Shot%202014-03-27%20at%2 010.23.38%20AM.png

Thanks in advance!