The offending line in my .config/nvim/init.vim seems to have been: runtime! ftplugin/man.vim Once that was commented out, everything seems to work again. I have no idea (yet) why this line should have been problematic. -- Peter King peter.k...@utoronto.ca
Ahah -- it's a known issue with the man.vim ftplugin, conflicting with the similar plugin that comes with vim. See https://github.com/vim-utils/vim-man, which says: If you were previously using man.vim that comes with vim by default, please remove this line runtime!