If I do Edit | Default Properties ... and then set up a new Category, e.g. "SunriseXP", importing an OPML file results in the category, for each feed, being set to "Unfiled". I would expect it to be set to "SunriseXP".

(As far as I can tell everything else in Edit | Default Properties is assigned to each feed).

Will fix.

Fixed in beta 10a (http://www.sunrisexp.com/download/).