MathJax: printing fails with version 2.1, works fine with 2.0.3

Created by: q4

Concrete example: http://www.inference.phy.cam.ac.uk/tcs27/talks/ceq.html#dir

Viewing this page in the browser (Chrome, Firefox, Safari) works fine, but when printing, the spacing and scaling of all MathJax elements is messed up and incorrect.

Interesting fact: When opening the same webpage with MathJax 2.0.3 loaded (rather than MathJax 2.1), the problem does not occur.

What changed between 2.0.3 and 2.1 which could have this side effect?