Pages (nor posts) do not update after editing

When i update a page or a post, click “update”, page refreshes, info “site updated” appears, but it doesn’t change in either in editor or when i display page. The same applies to posts.

I deactivated plugins, changed theme – it still doesn’t work.

But when i create new page and then edit it, it updates succesfully.

In the past two weeks i updated pages and all worked, i am not sure if i then updated to 4.2.3 version or earlier. I tried to reinstall (4.2.3–pl_PL) and it still doesn’t work.

Any ideas?

Thanks in advance!