nfs problems with fc2 server and rhel/rh9 clients
 

I am exporting filesystems on fc2 to varied clients (rh9, enterprise 3 builds 1 and 4). No problems on the rh9 clients, however the enterprise 3 clients exhibit "stale file handle" errors during client "find" commands, and on compiles that access the exported filesystems.
As a workaround, I was able to fix that problem with the following:

on the fc2 nfs server, changed /etc/exports to use async option
on the rhel3 clients, changed /etc/fstab to mount the exported filesystem with the "noac" option.

The "noac" option disables data and attribute caching and is slowing down our builds considerably (most of the libraries are nfs mounted from the server), so this is not an acceptable workaround.

The rpms on the fc2 server are: nfs-utils-1.0.6-20 and
system-config-nfs-1.2.3-2

I have searched this forum and others for help , no luck.
Any help would be appreciated.
thanks !!