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In November of 2009, when MO was just a few weeks old, we were exploring different ways to render math. One of the systems we tried would generate images, but this system is now broken. The upshot is that there are a bunch of posts that look broken.
If you come across these posts while browsing, please do fix them so that you and others can read them. Here's a bash one-liner that should do a pretty good job. Click "edit" on the post and copy-paste the source into a file post.txt. Then run
cat post.txt | sed -e 's|(http://latex.mathoverflow.net/png[^)]*)|×|g' -e 's/\\sb /_/g' | sed -e 's/!\[\([^×]*\)\]×/$\1$/g'
and paste the output into the MO input box. This command changes something like  into ![V_{ij}]×, and then into $V_{ij}$. The funny symbol × is inserted to clearly delimit the LaTeX source. It's still a good idea to make sure the correction is sane. For example, you may have to add some backquotes (these ones: `) around the dollar signs if there are lots of underscores making things italic.
Here's a list of all the culprits, generated from the most recent public dump with the command
grep 'http://latex.mathoverflow.net/png' posts.xml | sed 's| <row Id="\([0-9]*\)".*$|[\1](http://mathoverflow.net/questions/\1)|'
(I'm posting this command here so that I can easily generate an updated list of culprits next month)
20 2152 4062 4083 4115 4121 4125 4128 4130 4132 4133 4135 4136 4162 4169 4174 4180 4193 4233 4246 4251 4268 4276 4296 4297 4328 4333 4406 4409 4422 4424 4429 4452 4456 4459 4460 4473 4494 4516 4601 4615 4625 4658 4664 4669 4672 4674 4698 4709 4728 4779 4851 4865 4939 4950 4966 4984 5006 5008 5013 5044 5052 5064 5103 5122 5140 5144 5161 5179 5321 5338 5344
4600 4952 5106 are closed questions which can be safely ignored.
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