gitk Branch: field problem with 1.6.1

Greetings,

If I create a test repository as follows...

mkdir gitktest cd gitktest git init echo foo > foo git add foo git commit -m "foo" echo bar >> foo git add foo git commit -m "bar" git checkout -b branch HEAD~1 echo baz > baz git add baz git commit -m "baz" echo baz >> baz git add baz git commit -m "more baz" git checkout -b debug2 echo baz >> baz git add baz git commit -m "even more baz"

...and with gitk --all look at the "more baz" commit, it says "Branch: debug2" as shown here <http://www.iki.fi/azure/tmp/gitk-test1.png>. My understanding is that it should show "Branches: branch, debug2" but I might be wrong of course.

I have another test repository (I can make a creation recipe or make the repository available for download if needed) where, in addition to the problem above, gitk shows empty "Branch:" field for the master branch's tip commit.

Both tests made with 1.6.1 on Linux.