Can't su anymore

[Philip Mötteli]

Hi,


Since the update to Leopard, I can't 'su' to root anymore:

	$ su - root
	Password:
	su: Sorry


In the security log, I have the following entry:

	com.apple.SecurityServer[20]: checkpw() returned -2; failed to  
authenticate user root (uid 0)
	21.02.08 15:59:29 su[24444] pam_authenticate: Permission denied


But, I can login as root on the console, which also proves, that the  
root user is in fact activated.
When logged in as root on the console, I can do

	root # su someotheruser
	someotheruser % su
	root #


So, being in the root console, I can 'su' to root – though the prompt  
changes.


Thanks for any help
Phil