Group folders write-protected on client — but not on server

thanks to joels excellent tip re guest acces to enable automounting (and thus group folders) i finally got it set up: users with networked home folders and groups with group folders in /Groups all in netinfo/root -- cool. users log in and not only can find their desktop patterns and other settings but can also navigate /Network/Servers/... to find the group folder pre-mounted -- no more endless 'apple-k' sessions everytime to get to the server, yippi. however, the folders are write-protected! my first response was, of course to check the permissions: but a) each user in question is in fact a member of the appropriate group b) each and every file and folder within the group folder is owned by the group and the group has write-access as well as execution rights on the folders c) doing a su - in the terminal i cd'ed into the directory and all was swell: deleted a few files, created some new ones (touch foo.txt) one big reason to actually set up group folders was that my users shouldn't need to manually give group-write-rights to each file they create -- and now they don't even have write-access to their own files... any hints? tia, tom[/code]