Hmk? After the latest system updates on Gentoo I noticed WordPress was no longer able to open any kind of post list („invalid post type“), edit posts (you do not have access to this kind of post) or create posts (form shown, but right sidebar missing). Not quite uncommon, but this time it was no broken plugin – I could reproduce the same behavior with several other WordPress instances with different versions – even a fresh install. That’s a new one.
After some probing around I’m fairly certain Apache 2.4.26 is the culprit, after downgrading to 2.4.25 the problem disappeared. All other downgrades like PHP 7.0.15 instead of PHP 7.0.19 didn’t show any effect. I yet have to confirm which combination ultimately triggers the error (FPM? Event-MPM?), but if you have similar errors: Here is your starting point…
I use a FreeBSD server with PHP 5.6.30 and Apache. If I upgrade from Apache 2.4.25_1 to 2.4.26, then my admin of Joomla and WordPress sites will be error. Downgrade Apache and no problem.
I don’t no why.
Hallo! I had to revert back to 2.4.25-3 using .deb files and that solved the problem for me, so it’s not just you. All of our WordPress sites were affected. I posted the issue to the bug tracker for my Apache2 PPA repository, and someone shared a solution that might work for you:
https://github.com/oerdnj/deb.sury.org/issues/630
Viel Glück!
I had the same issue on FreeBSD – I deleted the latest update:
pkg delete apache24-2.4.26
and than reinstalled the older version from the /var/cache/pkg/ folder with
pkg add apache24-2.4.25_1-7618027f94.txz
This did affect all WordPress installations and all post types on that system.
Take a look at the last comment – adding „ProxyFCGIBackendType GENERIC“ to the Apache configuration worked for me.