Odd problem when running hugo locally

[richb-hanover]

The live bufferbloat.net site seems fine, but I get broken links everywhere when trying to run locally with hugo serve. I set up the following as an experiment:

[Introduction]({{< relref "bloat/wiki/Introduction.md" >}}) 
[Introduction](Introduction)
[Introduction](Introduction.md)
[Introduction](./Introduction.md)

The first and second links work as expected, but the third and fourth (with ".md" suffix) gives the plain/unstyled 404 page not found page. Any clues (beyond dropping all the .md suffixes?)

[richb-hanover]

Updating to hugo 0.16 solves this problem