I get the error message
Unicode char \u8: not set up for use with LaTeX.
Now I suspect that this is due to an invisible character. The command
:set list doesn't show anything suspicious and
:set display+=uhex doesn't seem to work for me. This post lets me assume that I also have something fishy going on.
Is there a way in vim to show everything that is in my file that is not a printable character? I am using MacVim Version 7.3 (53).