The tex I put in my forum post was parsed and display by the Moodle Tex filter (I don't think they have anthing special cooking in the forum.) I think the diff between the subscript being below or behind is whether the tex is inserted in display or inline mode (the more vertical expression reserved for display) You might try running mimetex from your browser address bar to see how it is formatted.... I am wondering if you are setting with mimetex as mimetex sets in display style, and you are setting I think in inline. I have to run and will not get time to look at this for a few days.... you really might wan to look at doing MathJax til you can figure this out.
Mathematics tools
Grainy images with LaTex
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