ok, I deactivated every plugin on that site (even the ones that are active in the other site too) and temporarily deactivated every network-activated plugin as well … it didn’t help.
I did use WP CLI for that – i can use it just fine, it doesn’t complain at all for that site …
When I activate a fresh installation of twentyfourteen on that site it leaves me with a ‘blank screen of death’ on every single page, no error message no nothing, nothing in the debug.log neither.
Switching back to the old theme it returns to the 404 behaviour.
Hi, and thanks for your answer.
the 404 page has the design of that sites theme.
The plugins that are active on the one site but not on the other are:
edit-flow, fusion-core, subscribe-by-email, js_composer, wp-mashsocial-wigdet, wp-status-notifier & wysiwyg-widgets
I suppose you will tell me to deactivate them one by one … which is a bit difficult as i can’t access the plugins page, but renaming the folders should do 🙂
will update once i’ve done that.