The MathJax noErrors extension causes $\rm\LaTeX$ expressions that contain errors to show the original $\rm\LaTeX$ code rather than an error message. That is certainly appropriate for viewing questions, so that if there is an error, you can at least see the $\rm\LaTeX$. But when you are writing a post, it would often be helpful to see the error message instead, so you can correct the $\rm\LaTeX$ more easily. So I propose that the noErrors extension be disabled during the MathJax typesetting of question and answer previews.

This can be accomplished by changing the RestartMJ function in mathjax-editing.js to be

function SetNoErrors (state) {
function RestartMJ () {
  pending = HUB.cancelTypeset = !1;

You could also clear up the problem with labels in preview by adding


to the beginning of the HUB.Queue call above.

+1 This would be very helpful when debugging hairy code. – Bill Dubuque Jan 19 '14 at 22:57

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