Actually, I just looked at the org-mode documentation on the site today, and noticed that the examples of use section (https://orgmode.org/worg/org-contrib/babel/languages/ob-doc-plantuml.html#org6cd541e) has the wrong ASCII output. The output should be
,---. ,-----. |Bob| |Alice| `-+-' `--+--' | Hello World! | |-------------->| ,-+-. ,--+--. |Bob| |Alice| `---' `-----' but instead it's just Bob -> Alice : Hello World! The results appear just find when I execute the org src code block on my local machine. Joseph