I have been thinking that to view the most recent xseq file in the preview pane, that I would need to save whatever changes I have made to the file in NC, then go to the preview pane, open up the file, then THAT would allow to preview the most recently revised file. However, when I "watch" a single model (e.g., a megatree) in NC then go over to the preview pane, the xseq file is playing in the preview pane. I feel pretty sure Sean has explained this before, but this one is kind of baffling me. It seems like the preview pane will display correctly (?) if I am playing the file "real time" in NC ?