As you may already know a new Plasma NM 0.9.3.0 applet was released last week, which means that Plasma NM 0.9.0.x is deprecated from now on. I will release Plasma NM 0.9.0.10 eventually to fix bugs already reported against 0.9.0.9. For those who can I advise to upgrade to the new Plasma NM applet.
To upgrade to the new applet you must first disable the old applet's plasmoid and kded modules. You can do that in systemsettings -> Startup and Shutdown -> Service Manager. Stop and uncheck "NetworkManager User Settings Service" then click on the "Apply" button:
To remove the old applet right click on the system tray applet's small triangle (the one that shows "Show hidden icons" tooltip) then "System Tray Settings" -> Display -> Extra Items. Uncheck the "Network Management" item that has a icon similar to a N letter, then click on the "Ok" button:
Bugs against the new applet must be reported in bugs.kde.org under product plasma-nm. Please do not report bugs against the new applet under "Network Management" product, that one is reserved for Plasma NM 0.9.0.x bugs.