plot() produces SEM diagrams in graphviz format, and relies on DiagrammeR (or a
graphviz application) to create the image.
The commercial application Omnigraffle is great for editing these images.On unix and windows, plot() will create a pdf and open it in your default pdf reader.
If you use umx_set_plot_format("graphviz"), files will open in with a graphviz helper.
Note: DiagrammeR is supported out of the box. If you use graphviz, we try and use that app, but YOU HAVE TO INSTALL IT!
On OS X we try and open an app: you may need to associate the .gv
extension with the graphviz app.
Find the .gv file made by plot, get info (cmd-I), then choose open with,
select Graphviz.app (or OmniGraffle professional),
then set change all.