XFCE4 systemload plugin doesn't show graphs.

Hello,
I just installed the xfce4-systemload-plugin, which is supposed to show me a nice little bar/graph showing me how much RAM / CPU I'm using at the time. The plugin does show, but I don't see anything in the graphs/bar. When I hover my mouse over it, I do get the correct output; it's just the graphs that show nothing.
Anyone on a possible fix?

I know this thread is old, but could you please post the solution for this issue?
Having installed:
yaourt -Qs hddtemp
extra/hddtemp 0.3.beta15.45-2
yaourt -Qs xfce4-sensors-plugin
extra/xfce4-sensors-plugin 0.10.99.6-2 (xfce4-goodies)
ps aux | grep hddtemp
root 9355 0.0 0.0 5968 952 ? S 16:04 0:00 hddtemp -d /dev/sda
cat /etc/conf.d/hddtemp
PARAMS="-q -l 127.0.0.1"
DRIVES="/dev/sda"
Also hddtemp can read my temperatures:
hddtemp /dev/sda
/dev/sda: WDC WD3200AAKS-00L9A0: 32°C
Suid-Bit is set
ls -l /usr/sbin/hddtemp
-rwsr-xr-x 1 root root 29272 5. Mär 19:10 /usr/sbin/hddtemp
Regards

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