Hello,
I have quite an annoying problem with krunner.
1. When I press Alt+F2 when the desktop is in focus,
the krunner doesnt appear until i press a letter. (not sure if this is desired behaviour)
2. When any application is in focus Alt+F2 does nothing at all.
3. When I run krunner as root, everything works fine.

When I run krunner as me I get this output:
[deu@Clifford ~]$ krunner
Trying to use rootObject before initialization is completed, whilst using setInitializationDelayed. Forcing completion

When I run krunner as root I get this:
[root@Clifford deu]# krunner
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
Trying to use rootObject before initialization is completed, whilst using setInitializationDelayed. Forcing completion
QDBusConnection: name 'org.kde.kglobalaccel' had owner '' but we thought it was ':1.1'
detected kglobalaccel restarting, re-registering all shortcut keys

Additional info:
[deu@Clifford ~]$ krunner -v
krunner 5.5.5

I have solved the problem. Had to move everything from ~/.config to some other place and t hen copy back some important files like k*, plasma* and akonadi*. I tried to find out which file makes the krunner not work but I had no success.