http://www.ams.org/notices/201410/rnoti-p1249.pdf
It's hammering Mathematica, but of course bugs like that can happen with any symbolic math software. Still, SymPy might be able to milk arguments from it. Such as: being open source, it's easier to find and fix the source of miscalculations like the one reported in that paper.
(I find it also remarkable that Wolfram let a known problem lie dormant for so long. That paper is going to hurt their name, badly.)
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