In case anyone's wondering what you're going to see even when all goes well, this is the result text I got from converting a realm with almost no content from Legacy to Other:
Code:
The following considerations arose during game system conversion...
All game-focused article categories were converted to generic equivalents
Domain 'Race':
One or more tags from the old game system were created for the new game system
Domain 'Class/Role':
One or more tags from the old game system were created for the new game system
Category 'Scene':
Snippet type 'Challenge': No mapping for tag domain 'Challenge Rating'
This realm has no Scenes, but it does have an Individual (so it uses Race and Class but not CR).