I made a theme of my own (based on the Default) and I added a template page or 2 especially for specific pages. I made five of these pages and selected that one page template from the dropdownbox ("Page Template").
But now - all of a suddent - I cannot choose my own page templates, only Archives and Links. Even though my own page templates (with the correct heading in the file are still in the theme's directory. What's up? Now, when I want to edit one of those pages with the virtually missing page template I get a revision message (an auto-saved one is "newer").
The page template still has this in the top lines:
<?php /* Template Name: Portfolio */ ?>