Hi Marnix,
According to the UML specification, the "Interface Realization" should be drawn as a solid line, If the Interface is shown as ball notation (Format -> Stereotype Display -> Icon).
If the Interface is not shown as ball (e.g. Format -> Stereotype Display -> Text), the "Interface Realization" will be shown as dotted line with a triangle.

Thanks,
StarUML Team
2014년 10월 31일 금요일 오후 9시 8분 56초 UTC+9, Marnix 님의 말: