metacity folder and alt short keystrokes

[Milton]

Hi all,
I did a fresh install of Ubuntu Precise and got Orca 3.4.1 running in Unity 2D.
When Alt_Tab for switching windows, Control_Alt_right-arrow to switch to the next workspace and Control_Super_D for minimizing all windows won't work deleting the .gconf/apps/metacity folder solves the problem after logging out and logging in.
Fortunately Control_Alt_T to open a terminal, Alt_F1 to the launcher still doing fine when this problem occurs.
The next time I starts up the machine I have the same problem with the Alt_Tab, etc. Do I miss something else to do for this problem to solve?
Milton
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