Featured image not showing up after 3.8 upgrade

I’m S.Korea engineer and I met the same issue.

I solved the problem not by easy trick but by all the database revising.

It is not simple problem and plug-ins are not guilty. It is only WordPress core problem.

And the WordPress security is nothing and if you want to rising the security, you can do it not by WordPress update but by Apache/NginX mod_security sentence.

Anyway, I tested 3.8~3.83 and they have all same problem.

If you’re normal user, don’t update WordPress 3.8x. it is my poor solution.

If you have 10000 post, you should do image download and re-upload and re-post revise and save at 10000 times.

p.s) I’ve tested it for solve the problem from PHP(Ts/Nts) 5.4.12 – 5.5.11, Apache 2.4.7-2.4.9, MySQL5.6.12-5.6.17, Windows 2k8 x64 to CentOS 6.4.

Symptom was same.