GNOME panel system monitor

In Rawhide:

$ rpm -q gnome-panel gnome-panel-2.23.3-2.fc10.i386

The system monitor in the panel, I've configured it to display harddisk I/O activity. I've changed the colours to use yellow for "Write" activity (and red for "Read").

It doesn't work, and the colours are used incorrectly. The display area in the panel stays black most of time, e.g. when downloading packages with Yum. It should display a yellow graph when saving files. Instead, when I load larger applications for the first time, the disk read activity results in a big yellow graph instead of a red one. It's as if Read/Write are reversed, but red=Read can be seen in the graph almost never.

Does it work for anyone else?