Plasma 4 plasmoid issues
Icon-only Task Manager
2015: Context menu entries to Unlock and lock Launchers are not present when right-clicking on a launcher. You have to find an empty space on the task manager.
2015-08: install unsigned packages
You are about to install unsigned packages that can compromise your system, as it is impossible to verify if the software came from a trusted source. "
(Not reported yet, wait for Plasma 5)