All of the posts made within custom posttypes have suddenly become uneditable, and will 404 when you try to view them.

The posts in the admin panel are greyed out (posts in the standard post/pages etc are fine).

Things I have Tried

• I have tried using GIT BISECT but problem persists beyong where I know it to be working.
• Tried downgrading wordpress
• Checked various database elements such as post status and post author.
• Tried setting and resetting permalinks.
• Deactivated All plugins

New posts seem to be fine, and work normally. But my metaboxes have also vanished!! Again, GIT suggests this problem going back beyond where I know them to be working.

It seems, as GIT is incapable of finding the solution, that it must either be related to the database or the wordpress core itself (as my GIT repo only tracks the theme)

Wordpress is up to date.