Clients Showing in Date Format As US In SP4

Last weekend we upgraded out primary domain and secondary domains to
Groupwise 6.5 SP4 from Groupwise 6.5 SP1. Since then, the secondary
domain is showing US date format in their clients whereas the Primary
Domain is showing the correct format of UK!!! Also, our webaccess is
showing in US format and not UK format.

Any ideas!?!