[wp-testers] 2.1b2: Problem with Akismet actions?

[Joefish]

Since installing 2.1 beta 2 on my public blog last night, I've had
three errors when working with Akismet. The first and third errors
have been when deleting spam comments, the second was when recovering
a comment. In each instance, the error has not prevented the
delete/recover action from occurring, it's just stopped the output
when the page reloads. The error I'm seeing is:

Warning: Cannot modify header information - headers already sent by
(output started at
/home/user/public_html/blog/wp-admin/admin-header.php:16) in
/home/user/public_html/blog/wp-includes/pluggable.php on line 275

Is this just me?