I got this because WP-Hide-Post disabled the Google Doc Embedder, as well as embedded YouTube videos. This plugin also disables the Google Doc Embedder, although I haven’t tested it with YouTube embedded videos yet. Any solutions?
This was partly my mistake. A rather elementary mistake.
When I made it so that the post with the embedded doc would appear under a tab instead of the front page, it indeed showed just the embed code, and not the embedded doc. But when I clicked on the title, the entire post appeared on its own page, and the embedded doc showed up.