Geoff,
By mixed, do you mean AD? When I rolled out 3.62 in a small (approx. 300 clients) NT4 domain / NetWare NDS, my Win95 clients had difficulty with Ingroup that was related to the provider order issue. Once the provider order was swapped, it was fine.
_________________________
Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.