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
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KDE4 keyboard shortcuts not working (Alt+F2, Ctrl+Esc, PrtSc...)
https://bugs.launchpad.net/bugs/183047
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