(In reply to Inge Svensson from comment #6) > I don't follow you. I believe I use Plasma 5 (in Tumbleweed) But Apper is a KDE4 application, as I already wrote. And it (only) uses the KDE4 style settings. Btw, the same problem happens in a KDE4 session (on 13.2 e.g.) if you set the widget style to Breeze.