I expected to see: When i create new custom field groups it doesn't show up in the custom post type after updating to 3.3.12
Instead, I got: Nothing. It doesn't show up in the custom post types.
I reverted back to version 3.3.11 and everyhting is working again. I am on a multisite so maybe there is an issue there? I am working on a subsite.
Oke just confirmed that it is working on the main site: clientsdash.com But not working on subsite.clientsdash.com.
When i revertd back to 3.3.11 it works on the main site and the subsite.
I can give acces to the website but i reverted back to 3.3.11 because i need to work on the site. I will put the debug information with the new 3.3.12 version.
I think i solved the issue. Sorry about that. I noticed that it also didn't show up with a older version.
I went to the Network Admin area and started to clear the database, litespeed cache and opcache and object cache. Then it worked.
I installed the latest version of views and did the same. Now it works. So for some reason i need to go into the Network Admin Area and delete all cache,database etc.
So it can be litespeed or closte. Closte is the hosting where i am at. They provide the opcache and object-cache clearing.
So for now all works again.
I found another isuue on another site but will open an other support ticket for that.
I had a ticket a few months ago with disappearing field groups in a multisite installation and I'm having trouble finding it, but I think the issue was related to object-caching. From your reply it sounds like that probably is the reason, I'll keep an eye out for any similar reports.