Version: (using KDE 4.1.2) OS: Linux Installed from: Ubuntu Packages The close button in Knotes (the white cross on light yellow) is barely visible. KDE 4.1.2 Kubuntu Intrepid
Created attachment 27824 [details] Screenshot
Still a problem with KDE 4.12.2 using Kubuntu 14.04.
Still the case, with light colours such as the default yellow you don't see the cross on the close button.