nfs exports to a netgroup on SuSE 9.1

I'm having no success getting nfs exports to a netgroup working on a SuSE 9.1 system. Exports to individual hosts work fine, and "ypcat -k netgroup" indicates that the host in question is in the netgroup... but rpc.mountd logs refused mount request from myhost for /export/mydir (/): no export entry My exports syntax is /export/mydir @mygroup(rw,no_root_squash,sync) Is this feature working for other people on 9.1 ? Dave