Screenshot: d.pr/4wMD (notice the column count)
Here's the actual text file: d.pr/hdS1
I have no idea where it came from, but this was causing this to appear in some users browsers: d.pr/SvEo
Regardless, I'd hope that these characters are somehow represented in Sublime Text in the future so that I can get rid of them, wherever they come from, before users have the opportunity to report it. Even if there is no character to represent, put a little square or triangle question mark or something, anything.