you could have wait a bit longer, or from yakuake itself run this command to reboot: systemctl reboot
Sometimes is possible that Plasma desktop to load slower, especially after an update, or if baloo starts indexing right away.
Without more information about your setup is quite hard to pinpoint the issue.
This should help you provide some good information:
Hello! after some dinking around, i found the solution to my problem, i'll be nice and share it, but it might or might not work for you:
i basically downloaded a bad package called lib32-gconf which deleted a lot of conflicting dependencies that convienient parts of my system used, and i downloaded this from AUR
lesson of the day: be careful what you download from AUR!!!