yum problem - and solution

The second time I ran "sudo yum update" after upgrading to FC-6
I got the error
Metadata file does not match checksum
even after running "yum clean all" and "yum makecache".

So I googled for
'yum "Metadata file does not match checksum"'
and got the advice
======================================
i did this
mv /var/cache/yum/* /tmp
than i run the yum install <appz>
======================================
which did indeed do the trick.

This leaves me slightly puzzled -
(1) Why did I get this error?
and
(2) Why did "yum clean all" not solve the problem?

--
Timothy Murphy
e-mail (<80k only): tim /at/ birdsnest.maths.tcd.ie
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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