Samba server is running on Alphaserver DS20E and is installed as a Gentoo
package using following steps:
emerge rsync && emerge -u --deep world && emerge samba 

Problem against WindowsXP: sometimes, when a user is creating a new folder using
Windows Explorer two folders are created instead of one. Names of resulting
folders: "New Folder" and "New Folder (2)". When a user is copying any file to
any folder he gets a message box which states following things:
  Error Copying File or Folder
  Cannot copy file_name: the specified network name is no longer available.

Problem against Windows2000: sometimes, when a user is creating a new folder
using Windows Explorer one folder is created as it should be, but an error
message box appears on the users display:
  Unable to create the folder 'New Folder'
  Cannot create a file when that file already exists.
When a user is copying any file to any folder he gets a message box which states
following things:
  Error Copying File or Folder
  Cannot copy file_name: the specified network name is no longer available.

Problem against Win98: no problem with Win98. It just works as it should be.

Samba log file contains following messages:
[2004/09/27 16:00:09, 0] lib/fault.c:fault_report(36)
  ===============================================================
[2004/09/27 16:00:09, 0] lib/fault.c:fault_report(37)
  INTERNAL ERROR: Signal 11 in pid 29054 (3.0.7)
  Please read the appendix Bugs of the Samba HOWTO collection
[2004/09/27 16:00:09, 0] lib/fault.c:fault_report(39)
  ===============================================================
[2004/09/27 16:00:09, 0] lib/util.c:smb_panic2(1381)
  PANIC: internal error
[2004/09/27 16:00:09, 0] lib/util.c:smb_panic2(1389)
  BACKTRACE: 0 stack frames:


configuration file:

ds20e samba # testparm
Load smb config files from /etc/samba/smb.conf
Processing section "[ftp]"
Processing section "[mldonkey$]"
Loaded services file OK.
Server role: ROLE_STANDALONE
Press enter to see a dump of your service definitions

# Global parameters
[global]
        workgroup = SAMBA
        server string = Samba Server %v
        security = SHARE
        map to guest = Bad User
        guest account = samba
        log file = /var/log/samba3/log.%m
        max log size = 50
        dns proxy = No
        printer admin = @adm

[ftp]
        path = /ftp
        read only = No
        guest only = Yes
        guest ok = Yes

[mldonkey$]
        path = /home/donkey/.mldonkey/incoming
        guest only = Yes
        guest ok = Yes