Missing Your Background Layer? Here’s The Fix
If you’re opening new documents and they don’t have a Background layer, there’s a reason (of course there’s a reason, everything has a reason; we just happen to know what it is). The reason is that you’ve selected the Transparent option in the New document dialog. That seems like a reasonable thing to do; everybody wants transparency, right? However, what it tells Photoshop is “Don’t worry about creating a Background layer.” To get Background layers again, the next time you’re in the New dialog, under Background Contents, make sure you choose White, and from then on, you’ll have Background layers in your documents.