I'm on my second site using Custom Post Types. Last time I used Easy Post Types, but thought I'd give Custom Post Type UI a try.
It seems to work well but when I set up a single-articles.php template ('articles' is the post_type slug), which is just a renamed single.php file, and it doesn't work. I just get a blank page.
If I remove the file, it uses single.php file just fine.
I'm stumped.
-mpm