Robert Hammen writes that, when using Mac OS 8, "if you have a folder on an NT server with some number of items (seems to be >100) open in List view, the Finder constantly keeps redrawing the list, withvarying numbers of items, increasing then decreasing."
Another reader describes this same symptom as "the List View has a tendency to jump or jitter. What I mean is that files in the hierarchy will move up and down on the screen. Sometimes items inside the nested folders appear to double themselves for a second and then disappear again. It's really annoying since it makes it hard to grab hold of a file."