I recently started using John Wiegley’s use-package for my Emacs init files. For Auctex, I used
(use-package tex :ensure auctex)
C-c vwould not launch the Skim, even though I was confident that the Skim was set to be the default viewer. Instead, no viewer would launch, and I’d see “View command: dvi2tty -q -w 132” in the minibuffer.
After seeing that some others had used a slightly different configuration, I changed mine to
(use-package tex-site :ensure auctex)
and everything started working fine. I still have no idea why, but it may help someone else.