Your suggestion of providing a customisation in which our own version of Error is create is exactly our approach. This solved most problems. I'll make sure I get back to you with further info once fully sleuthed! I also did some limited testing in a test version of Blackboard NG (technically Blackbaord 9.?). MathJax rendered, but it looked as if the line height calculations were being effected as lines looked rather crunched up (very noticable in 2D arrays). I may return to test this more thoroughly,...
Your suggestion of providing a customisation in which our own version of Error is...