—

There ... Did that work?

/writer clicks "Preview"

It did! Fantastic!

Now ... what happens when I try typing it in again?

—

/writer clicks "Preview" again

Terrific! It looks like the em dash should appear just fine.

/writer publishes post

UPDATE: WTF?! Why does the stupid Blogger software make em dashes become little annoying black boxes of retardation (or something like that)?

This is why I spend more time on Tumblr now ...

/writer publishes post, signs out of Blogger

EVEN LATER UPDATE: Apparently, changing my theme fixed the problem ... because I'm sure you were losing sleep over this, of course.