What caused an outlining rectangle & double entries under the apple?

A couple of days ago I played with the system preference, Universal
Access to magnify a picture on a site. I also ran ClamXav. Since near
that day I have double entries for Restart, shutdown, & log out under
the blue apple, and a rectangle that outlines what it wants to in the
finder and most apps. I have searched these 2 apps to see what could
have caused the differences (double entries & black rectangle), but can
find nothing. I have restarted several times, and repaired
permissions. Nothing makes a difference. It is also possible that it
happened before that, and I just didn't notice it.

I would appreciate any clues you can give me.

I am running OS X 10.4.6 on a dual 2 GHz PowerPC.
.

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