Activity Monitor not displaying processes or anything...

Hey guys,
My Activity Monitor (10.5.1) is not displaying ANY processes, in any of the tabs (system, CPU, etc.). I don't know why- I have a 2.16Ghz 24" iMac (previous iteration).
I did just add a 2gb stick of RAM (booted fine- everything BAR this monitor app is running perfectly). It has 3gb RAM total (previously had 2x1GB sticks). OSX System Profile displays it as 3GB and reads it properly.
Does anyone know why this is playing up, or what I can do? I have AppleCare so I'll call them tomorrow, but thought I'd see if anybody else incurred this problem.
Thanks!
Kendal.
Message was edited by: kendals

Is the little menu on the upper left set to "All processes"?

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See picture: http://bostonwebstudio.com/picture1.png
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