This has been a problem for years, but as I'm trying to perfect a very complex shader, I've had just about enough!  Why does Poser like to randomly move nodes around?  I polish off a material, work on something else, and when I return to that material, at least one node (usually the one I was last working with) has jumped a ridiculous distance away from all the others (and from where I left it).  And within a compound node, plugging in or unplugging an external input or output causes the input or output node to shoot off into left field too!  Seriously, developers, if you're listening, unless I'm doing something wrong or there's some setting that I'm not aware of, the RNM (Random Node Movement) has got to stop!  I just went back to a material I've been working on, and Poser has randomly decided to line up all the nodes along a vertical line, making it very difficult to see the flow of how my shader works!  I lose alot of time just repeatedly dragging and scrolling to bring a distant straggler back into reasonable proximity to other nodes!