Tiens, le pb devrait être résolu avec la mise à jour 10.6.7 de MacOS X:
http://support.apple.com/kb/HT4472?viewlocale=en_US&locale=en_US
Fixes a rare issue in Mac OS X v10.6.5 that could cause user accounts to disappear from the Login window and System Preferences after putting the system to sleep.
http://support.apple.com/kb/HT4472?viewlocale=en_US&locale=en_US
Fixes a rare issue in Mac OS X v10.6.5 that could cause user accounts to disappear from the Login window and System Preferences after putting the system to sleep.