multiplicity and vista as slave

hello

i have multi pro latest.
i am running xp pro as primary and vista ultimate as secondary and multi
wont work.
when i press "troubleshooting" on primary it recognizes the vista. it
recognizes vista also from within the multi on the primary.

i know multi works becouse it works with my laptop which has xp pro as slave
(xp primary and xp slave works ok).

what is it ? do i need to enable something in vista ?
i turned off vista firewall just to make sure and nothing.

the troubleshooting on vista says the winlogon dll isnt on.

help any1 ?