I know many of you are still running some PowerPC based Macs. Apple has posted a kbase article over the weekend that relates to an issue with PowerPC based Macs, managed client, and the 10.5.7 update here:
http://support.apple.com/kb/TS2762From the article:
"After updating to Mac OS X 10.5.7, a user may not be able to log in to a managed client workstation. On startup, or after entering the user name and password, the user may be prompted for an administrator name and password, but nothing can be entered.
This issue can occur on PowerPC-based Macs if the file /etc/authorization is not updated correctly when installing the Mac OS X 10.5.7 Update."
If you have run into that issue on your PowerPC Macs, be sure to read the rest of the article, as it tells you how to fix it. Thanks to those of you who immediately contacted AppleCare when you ran into that issue.