In MW 1.18 and 1.19, without Extension:PasswordReset installed, the login page directs users who have forgotten their password to a page Special:PasswordReset. This blocks any use of the extension PasswordReset.
If the extension is installed, Special:PasswordReset is dysfunctional. This may be new, under previous MW version (trunk SVN r79596) extension PasswordReset was working.
Version: unspecified
Severity: critical
URL: http://www.mediawiki.org/wiki/Extension:Password_Reset
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=29135