You could delete the ac3dprefs8.txt file from your home directory. That should fix it.
If you don't want to lose your current settings, edit the file and check this line:
Quote:
ui_gadget_layout "utils 1 surfacetype 1 visibility 1 objectname 0 extrude 0 palette 1 thicken 1"
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I suspect palette has gone somehow so you can insert it back. The number indicates open/closed.