In arrays in MathJax I needed always ***three*** backslashes to force a new-line; that was specific for MO and not so in MSE, for instance, where one needs only ***two***. Now that we are in the stackexchange network this is adapted; but the old three-backslash-answers are now broken, for instance my answer in: http://mathoverflow.net/questions/84958/is-sum-limits-n-0-infty-xn-sqrtn-positive/85010#85010   

Can we do something about it, for instance one sql-formulation over the full database of questions, answers and comments?     

*(Remark: this is different from the problem in https://meta.mathoverflow.net/questions/238/double-backslashes )*