Migrating from Drupal – content in db, but empty page shown.

I am trying out WordPress after having used Drupal for a few years, following the instructions at https://www.darcynorman.net/2007/05/15/how-to-migrate-from-drupal-5-to-wordpress-2/
I think I have all categories, posts, and comments migrated.

When I click on Manage, I can see the titles of the posts, and the comments, etc. But when I go to the site main page, or click on View in the Manage – Posts admin page, I get a completely empty page (just this code at the main page for example in the head, and a br in the body):
<title>index.html</title>

I can click on Edit in the Manage – Posts area, and that works fine – it shows the correct body of the post.

Any pointers on what to look for, where to start debugging, appreciated. I am using an older version of WordPress, because 2.3.3 database tables have changed, and the Drupal migration script at the link above needs the older tables.