The files are AVCHD and 720P. I chose HDV and 720P when I created the project. I should mention a few of the clips are fine. Several others have this problem.
Is that other post saying I should drop the clips onto the New Item icon when I import them? I've never heard of that. I've always just dropped them into the middle of the project window and have never had a problem. Even in this project, some of the clips are fine. Odd that some are and some aren't.