Can't reproduce here:
$ mkdir git
$ cd git/
$ git init
Initialized empty Git repository in /tmp/git/.git/
$ git config user.name 'Matthieu M. Moy'
$ cat .git/config
[core]
repositoryformatversion = 0
filemode = true
bare = false
logallrefupdates = true
[user]
name = Matthieu M. Moy
$ touch foo; git add foo
$ git commit -m "foo"
[master (root-commit) 6814174] foo
0 files changed, 0 insertions(+), 0 deletions(-)
create mode 100644 foo
$ git log
commit 681417491423260ad13c3fb59c28fc96a68bf4f9
Author: Matthieu M. Moy <Matthieu.Moy@imag.fr>
Date: Wed Jun 24 19:05:43 2009 +0200 foo
$ git version
git version 1.6.3.rc1.35.gabb3a
$