X session messed up after upgrading to fc6. How to reset Gnome.

[Monkey Pet]

Hi,  I just reinstalled fc6 (over fc5).  The installation went well.
However, when I copied my old home directory over, everything went haywire.
Now, when I login to the X session via gdm, I get just a cursor, nothing
else, no icons, no menus, nothing.

I want to keep my old home directory, but want to force it to regenerate
whatever is needed for gnome... how do I do this?  What files do I delete or
copy??  thanks.
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