Remove setting of background-color on iconed group box children just in case that was causing Tiy's problem. Is useless until PaintOnScreen + border-radius is resolved anyway.
[Desktop Entry]
Type=Application
Version=1.0
Encoding=UTF-8
Name=Hedgewars
GenericName=Fighting Hedgehogs
GenericName[tr]=Worms Benzeri Strateji Oyunu
GenericName[ru]=Битвы ежей
Icon=hedgewars.png
Exec=hedgewars
Terminal=false
StartupNotify=false
Categories=Application;Game;StrategyGame;