0.7.4 Article formatting problem

[Nokonium]

I have two articles, as far as I can see the formatting is identical, but the display isn't. I'm not sure if the PEBCAK or not.

[edit] This was posted after umpteen Ctrl+F5's and it was still borked. However Murphy rules and I have just gone back to it to find it is displaying exactly as it should do AAAAAAAAAAAAAAAAAAAAAAAAARRRRRRRRRRRGGGGGGGGGGGGGHHHHHHHHHH!

I will delete the rest and find somewhere dark to hide.

[bloc]