artifacts in gtk sw, under kde

[lordalbert]

Hi,
I have some artifacts in gtk software, i'm using kde.

I've installed x11-themes/oxygen-gtk (both 2 and 3) and selected oxygen-gtk theme in kde settings.
The problem is that i have two vertical line in the top of the gtk window.

This is an example of Filezilla: http://i.imgur.com/tLeF8zq.jpg but it happens also with other gtk software.

Have you any idea to solve?

thank you!