I had the same problem as you, and found the hidden blocked shortcut (Win+J) here:
~/.kde/share/config/khotkeysrc
In my case it looked like this:
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Source code
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[Data_1_5]
Comment=
Enabled=true
Name=K Menu - eclipse-3.2-eclipse-sdk-3.2.desktop
Type=MENUENTRY_SHORTCUT_ACTION_DATA
[Data_1_5Actions]
ActionsCount=1
[Data_1_5Actions0]
CommandURL=eclipse-3.2-eclipse-sdk-3.2.desktop
Type=MENUENTRY
[Data_1_5Conditions]
Comment=
ConditionsCount=0
[Data_1_5Triggers]
Comment=Simple_action
TriggersCount=1
[Data_1_5Triggers0]
Key=Win+J
Type=SHORTCUT
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I removed all that code, saved the file and assigned my new key in menu editor!
Good stuff, eh? :-)
Remember to not have the menu editor open while you edit the file.