On the question How can I get rid of indentation after an equation?, the code block has had the bit between the dollars turned in to an image. Looking at the javascript scripts loaded via firebug, I notice one called 'math-tex'. I'm guessing that this is the culprit.
Could whoever decided that this was a good idea please turn it off. The question linked to above demonstrates all the reasons why this is a Very Bad Idea. I'd also like to point out that my answer to the We need Tex markup is the only one with net (strictly) positive votes.
Unless, of course, this is some subtle plan to encourage everyone to write their source code properly (ie using \( ... \)
instead of dollars) in which case I whole-heartedly approve.
$...$
but there have been several times I've had to rewrite some normal text so that it doesn't use multiple dollar signs in one line.