While this is not solved here's a workarround:
With kde is stopped edit .kde4/share/config/kglobalshortcutsrc
Go to the yakuake section and replace "F12" with "Menu" (whitout quotes)
start kde
While this is not solved here's a workarround:
With kde is stopped edit .kde4/share/ config/ kglobalshortcut src
Go to the yakuake section and replace "F12" with "Menu" (whitout quotes)
start kde