using su to quickly login to root or to another user account fails, returning the error "invalid password"
However, this password works fine to login from the login prompt.
Where should I start looking to find the problem.
With this little information, any suggestion is really a guess.
That said, I'd look for a mismatch between the su program and your other authentication programs (like login). Possibly you've got an su that doesn't use the PAM stuff properly; assuming you are using PAM, see if the config program for su (maybe /etc/pam.d/su) differs in some way from other PAM config files.
I encountered a transient problem of this source once with ftp authentication on Debian Unstable (Sid) systems, and was able to fix it by changing some entry ... I forget the details now ... in /etc/pam.d/wu-ftpd, until the error got cleaned up upstream.
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