I too am having the exact same problem with AutoCAD R14 and Samba. We are running samba 1.9.17p2 on a Sparc 5 w/ Solaris 2.5.1. Clients are running NT4 w/ SP3. I tried turning off fast_share_modes on 1.9.17p2. I also tried samba 1.9.16p9 to no avail. I tried manipulating the read size. I spent two hours before throwing up my hands and looking to the samba web site where I saw your message. I previously had very good luck with AutoCAD R13 and 1.9.16p9 at my previous job so I was very surprised when R14 and samba wouldn't work well with each other. I am a system administrator with no programming experience. I will offer any help that I can so this problem can be worked around.