I moved my blog (about math) from WordPress.com to a self-host WordPress. When I tried to import the old content, having WordPress.com LaTeX markup, I figured that all backslash
\ were missing.
See how formulae messed: http://gauravtiwari.org/wp-content/uploads/2013/11/Screenshot-29.png
In real, this is how they should appear: http://gauravtiwari.org/wp-content/uploads/2013/11/Screenshot-35.png
I had to edit each and every post as there were no '\': http://gauravtiwari.org/wp-content/uploads/2013/11/Screenshot-27.png