(try any dark theme)
Ok seemingly, this occurs only when *updating* an xfce 4.12 to 4.14 ..
I already was wondering how this could have not been reported yet..
still figuring out the exact cause ..
Created attachment 9643
Xfce 4.14 after update from 4.12, with adapta nokto theme
Created attachment 9644
Xfce 4.14 after update from 4.12 with adwaita dark theme
I don't know if these themes support the Xfce panel in Gtk3, I suspect not. This is why the Gtk2 parts/plugins are themed correctly and the Gtk3 ones are not.
Please try Greybird-dark and see if that fixes the problem. If so we know it's the themes not supporting the Gtk3 panel.
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