Xcode 3.1.2 No Editor

This is bedeviling me! I have Xcode 3.1.2, then installed iPhone SDK 2.2. My first try at an iPhone project, the project window shows "No Editor" where the text editing window is. I reinstalled Xcode 3.1.2 package, including Developer tools, and get the same thing in a project window, ANY project window! iPhone, "Hello World" in C, it's all "No Editor."
Anyone have any idea how I can fix this, so I can actually put code into the friggin' projects?
TIA

Okay, I'm an idiot - please ignore!

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