Permissions not fully applying to automounts?

I have some folders on a share point that autmount for certain user groups. They show up ok (except the icons are “?” until I click on them for some reason–posted this in another topic). However, the users can read the folders but not write to them. They have ACL permissions set up for full control and Cmd-I lists them having “custom” permissions. If I eject the share and manually afp connect (using the same credential information), I have full read/write privileges.

I have noticed when it automounts, the connection listed in the AFP server in Server Admin is listed as Guest instead of the appropriate user and things no longer work when I turn off guest access in the AFP server. I realize this is probably the root of the issue, but don’t understand why it’s doing this. DNS seems to check out and I’m assuming Kerberos is fine because all the signons and other Kerberos-only authorizations seem to work fine. I’m fairly new to servers and am not sure where else to look to check what might be wrong.

Thanks for any help.