I have a very similar problem. I change the update interval of the system monitor, but when I closes the preferences dialog and then reopen the update interval has been reset to 0.00.
gnome-system-monitor 3.8.2.1-2ubuntu1
Ubuntu 14.04
$ uname -a
Linux maxwelld-linux 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
I have a very similar problem. I change the update interval of the system monitor, but when I closes the preferences dialog and then reopen the update interval has been reset to 0.00.
gnome-system- monitor 3.8.2.1-2ubuntu1
Ubuntu 14.04
$ uname -a
Linux maxwelld-linux 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux