Cannot mark users as spam

[Ipstenu]

Using 3.1 nightly (from this morning) I cannot mark a user as spam from wp-admin/network/users.php

I search for the user, find him, select his check box, pick 'Mark as spam' from the drop down, and nothing happens.

If I delete him, it works fine, but I can't mark or un-mark spammers.

Tested on two installs, one with and one without BuddyPress (JUST in case) and I got the same result.

[Ipstenu]

It works on RC1 and RC2 but not RC3, so ... something was introduced there.

[nacin]

#16364