I got a short story rejection back the other day. No big deal. It happens.
The rejection slip was of a form nature, though at the bottom was scrawled a small bit of advice:
Don't skip extra lines between paragraphs.
My first thought was: huh?
After a little investigation, however, I found this setting that was unchecked in Microsoft Word (it's obviously checked now):
Problem solved, and hopefully the next editor will be a little bit happier.
That story, by the way, is already back out to the next publisher.