Denis
Try setting File Caching = OFF at the client, and leave the True Commit ON. If the problems disapear, and you have many workstations, Neils prop. to do that in the server is the way to go.
I always set Op. Locking off at the server anyway, as a security measure to prevent data corruption ( this is particularly true with Win2k and 2003 Server ).

Jaime

>Neil and Jaime, Many thanks indeed for your replies. Some info follows, Denis
>
>>Is the low memory being reported on the server console or the workstation, >also are there any other errors being reported on the server console.
>
>On the workstation - there are no errors on server console.
>
>>What version of Novell server?
>
>NOVELL NETWARE VERSION 5.2
>
>>What do you have, in the Novell Client properties - Advanced Settings tab, for File Caching and >File Commit ?
>
>The client has :
>FILE CACHING = On
>FILE COMMIT = On