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binomial sum bug


In:  Sum[Binomial[5,2k],{k,0,5}]
Out: 16

In:  Sum[Binomial[n,2k],{k,0,n}] /. n->5
Out:  -16

What the?

This has been addressed before [mg70486]
about a year ago and a work around was posted
but I have two questions:

1. Was it declared a bug by Wolfrram, and
2. In general does Wolfram issue bug fixes, and specifically is there
a patch for this problem?

$Version = 5.1 for Microsoft Windows (October 25, 2004)

Regards,
Jack Kennedy


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