Can't write large files to SAMBA share - small files are okay

Windows 7 and Windows XP clients, OpenSUSE 11.4 (current patches) server. I can write 1 MB files but can not write any larger. I can read any file in the shared directories. Here’s the smb.conf file (transcript because I can’t email from my SUSE box any longer - but that’s a different thread):

[global]
log file = /var/log/samba/log.smbd
usershare max shares = 100
os level = 20
null passwords = yes
domain master = No
encrypt passwords = yes
public = yes
add machine script = /usr/sbin/useradd -c Machine -d /var/lib/nobody -s /bin/false %m$
passdb backend = <my local value>
guest ok = yes
ldap suffix =

[Common]
writeable = yes
read list = bacula
delete readonly = yes
write list = Jim,nobody,root
path = /var/samba/common
force group = nogroup
force user = nobody
comment = Common Windows Files
user = Jim,nobody,root,bacula,@nobody,@nogroup,@root,@users
max connections = 12
inherit acls = Yes


Looking at the /var/log/samba/log.smbd indicates that the connection is getting dropped, but this only happens during writes of files larger than 1 MB. That doesn’t make any sense to my feeble little grey puddle.

Additional data - here’s the /var/log/samba/log.smbd file…

[2011/11/22 20:15:44, 0] smbd/server.c:1134(main)
smbd version 3.5.7-3.5.1-2573-SUSE-SL11.4-i386 started.
Copyright Andrew Tridgell and the Samba Team 1992-2010
[2011/11/22 20:16:17.745707, 1] smbd/service.c:1070(make_connection_snum)
cpq6910p (192.168.1.66) connect to service Common initially as user nobody (uid=65534, gid=65533) (pid 9084)
[2011/11/22 20:16:58.150145, 0] lib/util_sock.c:474(read_fd_with_timeout)
[2011/11/22 20:16:58.150689, 0] lib/util_sock.c:1441(get_peer_addr_internal)
getpeername failed. Error was Transport endpoint is not connected
read_fd_with_timeout: client 0.0.0.0 read error = Connection reset by peer.
[2011/11/22 20:16:58.151083, 1] smbd/service.c:1251(close_cnum)
cpq6910p (192.168.1.66) closed connection to service Common
[2011/11/22 20:16:58.154086, 1] smbd/server.c:267(remove_child_pid)
Scheduled cleanup of brl and lock database after unclean shutdown
[2011/11/22 20:16:58.215244, 1] smbd/service.c:1070(make_connection_snum)
cpq6910p (192.168.1.66) connect to service Common initially as user nobody (uid=65534, gid=65533) (pid 9141)
[2011/11/22 20:17:18.154258, 1] smbd/server.c:240(cleanup_timeout_fn)
Cleaning up brl and lock database after unclean shutdown