Comment 1 for bug 183047

As seen here (I copy and paste the text) this is an unresolved bug
http://software-libre.rudd-o.com/KDE_4.0.0_emergency_FAQ#Global_shortcuts_.28ALT.2BF2_for_KRunner.2C_ALT.2BTab.2C_etc.29_aren.27t_working.3F.21

Global shortcuts (ALT+F2 for KRunner, ALT+Tab, etc) aren't working?!

Several people have mentioned this. This is an unexpected bug, it could be that:

   1. kded is not running, or
   2. that the GlobalAccel KDED module is not loaded.

The latter issue can be determined by issuing

    qdbus org.kde.kded

from konsole and seeing if KdedGlobalAccel appears in the output. If you get Service 'org.kde.kded' does not exist. you may issue

    kded4

to restart the daemon, followed by

    qdbus org.kde.kded /kded loadModule kdedglobalaccel

to try to load the module. If KdedGlobalAccel does not appear, then you have this problem, a fix isn't know, yet.

There is a bug report filed at bugs.kde.org: http://bugs.kde.org/show_bug.cgi?id=155429