Can't install programs nor change system settings because admin password is not recognized on Mac OS Lion I can't install programs nor change system settings. I have admin privileges and I can successfully login into my account. I can even perform admin operations in terminal using sudo command.

But, when I try to install new software and enter the admin password, it always give me an "incorrect password" message.
Have you done any of the obvious fixes yet?


repair file system
repair permissions
check keyboard encoding when prompted for password entry
...


Have you looked into the system.log for possible hints?