To see the problem:

1. Open the Processes tab in System Monitor.  Make sure that View->Dependencies is unchecked.  Click on the Process Name header to sort processes by name.
2. Scroll down part way through the process list.
3. In a terminal window, start a large build that will compile many files.

As the build creates and destroys processes, System Monitor will change the scroll position: it will jump forward periodically.  This is annoying when you're trying to read the process list.  It would be nicer if the scroll position stayed constant in this situation (of course, System Monitor should still insert and delete processes from the current viewport when applicable).

This is related to bug 611735 (memory map scrolls on each refresh).