Wrong author names in Post Revisions

Hi,

I just upgraded to WP 2.6.
Now I’m wanting to use the Post Revisioning feature.

Everything works fine with it (meaning Revisions are saved with the correct timestamp and correct diff), BUT the author does not change.

Example: When I log in as “Foo”, a newly created post will have the author name “Foo” in the post revision overview.
When I then log out and back on as “Bar” and add some changes to that post, another post revision is added correctly, only with the wrong author name behind it (still “Foo” instead of “Bar”).
(Note: “Foo” and “Bar” are not the real usernames I use, in reality I tried it with correct ones of course.)

Whats wrong here? Can anyone reproduce this on his site?

Thanks a lot!
Tobias