User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-27408862-20150529113010/@comment-1618941-20150529222835

I had a look at that plumbob template...

It was created in 2014 using code for Gecko (Mozilla Firefox) that Firefox hasn't used since 2012. Although the border radius style for Firefox on that template was incomplete and wouldn't have worked before 2012 anyway.

The template broke because it has the font size set to 100% inside a 124px by 40px box. You can't blame this update for that. The template had problems scripted into it from the start, and the update only highlighted one of those problems.