[Samba] unable to connect to a share, error message: "string overflow"

[Peter]

Hello list,

after upgrading from samba 2.2.5 to 2.2.6 or 2.2.7 I get a whole bunch
(in fact thousands of them) of the following error messages in my
smb.log

  ERROR: string overflow by 10 in string_sub(%u, 7)
[2002/11/23 18:46:51, 0] lib/util_str.c:string_sub(1188)
  ERROR: string overflow by 10 in string_sub(%u, 7)
  ERROR: string overflow by 10 in string_sub(%u, 7)
[2002/11/23 18:46:51, 0] lib/util_str.c:string_sub(1188)
[2002/11/23 18:46:51, 0] lib/util_str.c:string_sub(1188)
.
.
.

when trying to connect to a share. Of course the connect fails.
What is happening here? It certainly looks like a string (the username
perhaps?) is too long but it worked perfectly before. What can I do
about that?

Thanks
Peter