Many Kadu icons are SVG and without qt-svg available at runtime they are not displayed. There was a common dependency on x11-libs/qt-svg in the 0.10.1 ebuild but it was dropped in 0.11.0 (it should be RDEPEND only though, not DEPEND too like in 0.10.1).
Yeah, apparently I indeed removed that qt-svg dependency even if it was explicitly added earlier. Restored. Thanks for reporting.