I have noticed this issue with many KDE 4 distros. It's mostly relevant in KDE SC 4.13.2 and 4.14. The distros that I have noticed this with is PCLinuxOS Plasma 5 Preview, Linux Mint, Mageia 5, Solyd K, and Kubuntu 14.04. I did post this to KDE bug reporting but nothing has been done with it.
The problem noticed is when a person navigates to System Settings, Windows Appearance, Windows Decorations, Get New Decorations; the add-on installer is stuck on initializing. Just wondering if anyone is having this issue and if there is a work around or if it has to do with Plasma 5 migration.
Thanks and Happy 16th LQ!