Page Title overrides any views argument. It seems that it thinks that the [page-title] token for these views is always "Home". The reason I think this is because I have set my "Default" pattern on "admin/settings/page-title" to "[page-title] | Test" and it sets the <title> tag to "Home | Test" for all views pages that use an argument.

My argument-based views work fine without Page Title. Page Title works fine without argument-based views. But the two don't get along!