Version: (using KDE 4.3.2) OS: Linux Installed from: Debian testing/unstable Packages When switching between Kickoff and Classic Application Launcher styles, the custom icon set as the icon for the launcher is forgotten, and the launcher starts using the default icon again. To see, go into application launcher menu settings, change the icon, then switch menu styles. The icon for the menu will go back to the default "left arrow" icon, even if you switch back to your original menu style.
already reported and known; too tired to find the duplicate bug report at this point.