Just this afternoon, for no reason that we can find, we suddenly found that we couldn't publish or trash ANY of our posts.
I can edit the title through Quick Edit, and I can change the content in full edit mode if I click "save draft", I can even change the status between Pending Review and Draft - but I can't Publish or trash the post.
This affects existing posts which are pending review or draft, and new test posts that I created in order to test this. It was reported by one of our editors, but it also affects me - and I'm the Administrator of the blog, so it shouldn't be anything to do with user permissions.
I've tried deactivating all plugins, it didn't help. We haven't installed any new plugins or changed any settings (I'm the only Administrator, and I haven't logged onto it in days until this afternoon)
I've tried rebooting the server, still nothing.