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

This message box appeared at desktop startup without any apparent reason:

"Plasma shell

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. "

I wonder if this is something to worry about.

(Not reported yet, wait for Plasma 5)