If you’re still using Thesis 1.x, you’ll be happy to know we’ve released Thesis 1.8.6 for full WordPress 4.0 compatibility.
Finally, just to be clear—if you’re using Thesis 2 (and specifically, the latest version, 2.1.9), your site is fully compatible with WordPress 4.0.
About the Author: Chris Pearson, Thesis creator and DIYthemes founder, is obsessed with optimizing the web and making sure every last detail receives the attention it requires. Follow DIYthemes on Twitter for the latest tips and info on building effective websites.
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