This is an "imperfection", not a bug.
In the right hand side of "An Identity of Ramanujan" at <http://www.mathjax.org/?page_id=13>, there are a series of vinculums (fraction bars). In Firefox 3.5.6 OS X, these render with different apparent thicknesses, and which vinculums are thick or thin *change* depending on which magnification I use. (Safari and Chrome on OS X both produce nicer results.)
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