KDE application launcher shortcut ALT+F1 not working after reboot

Solution 1:

I am on OpenSUSE 42.3 but found the following: I had to edit ~/.config/plasma-org.kde.plasma.desktop-appletsrc in addition to ~/.config/kglobalshortcutsrc. You will look for the widget number you want to delete (Widget 56 in my case), and then delete the referenced to that number (picture attached). In my case, I had to delete the entire [containments] section that the launcher was in ([Containments][21] in the picture), due to a panel that disappeared during a driver upgrade.

After that, I deleted the reference to the shortcut in ~/.config/kglobalshortcutsrc, then logged out. When I logged back in, I was able to set the shortcut as I wanted.