This is a high-traffic WP.com blog... and has had unchanged/stable custom CSS for several years.
Suddenly, twice in the last month or so, the site presentation has gone wonky. You can look at any page and compare with the google cache to see the difference.
WP.com support says that it's our fault, because the site doesn't pass CSS validation... yet all the CSS errors are in WP.com css, not ours!
How do others deal with this kind of thing?
Got any idea what is wrong?
The blog I need help with is climateaudit.org.