In several old questions/answers I have seen in MathJax the combination \\,
where it obviously should be \,
and also \*
where it should be just *
- the result is a badly distorted formula, torn into confusingly displaced pieces in the first case, and just a red $\*$ in the second case.
I have just corrected it for https://mathoverflow.net/a/104701/41291, and I have done this at least twice before, so I now suspect there might be some bug doing this.
On the other hand this seemingly only occurs in relatively old posts, so maybe there was a bug which is extinguished by now.
Is this a known issue?