by Iñaki Arenaza.
Interestingly somebody just pointed me towards a bug fix in the Moodle Tracker, fixed in 2.4.3, juding by the dates the fix will be in build I'm using.
This is the change I mentionned in my previous post, and as I said, it has nothing to do with NTLM SSO, so it doesn't affect you at all (with respect to your SSO problem, that is )
Saludos. Iñaki.