In the past couple days it appears that new MathJax fonts have been deployed. In my environment these fonts are a big step backwards compared to the prior fonts. They are a lighter face and render so lightly that they look like text typed by an old typewriter running low on ink. Moreover, the style of the font is a very poor choice for mathematics text. Many characters render jammed together, the i's and j's are horrendous, etc. None of these problems occurred with the prior fonts.
Note: the problems may be more noticable to me because I use roman fonts for my math text - which renders more lightly than the default fonts. Also, I use the default web downloaded fonts, not the STIX fonts (which I find very ugly). Is anyone else seeing these problems?