I am in a plain Openbox session. When I first try to launch krunner (from urxvt), I get this

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Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Couldn't find node help. Skipping rendering.
"/usr/bin/krunner(4887)" Error in thread 140604121257856 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/krunner(4887)" Error in thread 140604121257856 : "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/krunner(4887)" Error in thread 140604121257856 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/krunner(4887)" Error in thread 140604121257856 : "QLocalSocket::connectToServer: Invalid name"
"/usr/bin/krunner(4887)" Error in thread 140604121257856 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/krunner(4887)" Error in thread 140604121257856 : "QLocalSocket::connectToServer: Invalid name"
krunner(4887)/kdecore (services) KServiceFactory::findServiceByDesktopPath: "" not found
QDBusConnection: name 'org.kde.Kephal' had owner '' but we thought it was ':1.3'

and it does not open.

However, the second time I launch it, it opens with no error messages.

Couldn't find node help. Skipping rendering.

Which theme are you using? Can you try switching back to the default Air theme?

If you are using Air, then please log out of KDE and remove /var/tmp/kdecache-$USER/