I also see the same issue for the gnome-system-monitor.
This issue also only appears when the Murrine theme engine is used. Perhaps there is some RGBA support activated? Temporary workaround is to just use Human-Clearlook as theme.
I also see the same issue for the gnome-system- monitor.
This issue also only appears when the Murrine theme engine is used. Perhaps there is some RGBA support activated? Temporary workaround is to just use Human-Clearlook as theme.