On Tue, 5 Feb 2019 08:12:20 +1100 "Tobin C. Harding" <me@xxxxxxxx> wrote: > I tried to investigate this further and I am unable to reproduce the > original warning. I'm using python virtual environment as directed by > the output of `make htmldocs` so the environment should not have > changed. The only other plausible explanation seems to be that I've > gone mad and can't remember what I was doing three days ago. You are not the first to have reported such issues, though; I've seen a couple of things go by in the past. Until we understand what is going on, it's probably best to avoid hyphens in labels. Thanks, jon