So its fixed for me as well. Uninstalled quotas, and had it reporting on /(root) instead of /home.
Followed directions above (as root) and that fixed it. I did not, however, have a disk_datah.php in the same folder, but i was able to find it in /root/QuickBox/dashboard/widgets and I copied it from there to the folder that "dashboard" put me in (/srv/rutorrent/home/widgets).
Now, I just have this crazy % with 10 decimal points, see here: http://imgur.com/gnIQ7ew
Any ideas, is that normal, or did I mess something up and will need to edit the php myself to fix it for now?