As of yesterday, the DB has been going through some glitches that remove the effects of coding from answers. So far I have only noticed this on the Meta, but it could extend elsewhere.
EDIT: Ironic how it's working for this question, no?
Took a look at this, and the problem is there wasn't a line break between the image definitions (eg ![Fred Flintstone][1]) and the image URLs (eg [1]: http://...).
![Fred Flintstone][1]
[1]: http://...
I've updated the post now :)