Please file a separate bug report for your issue, which is unrelated to the other issues discussed in this bug report.
Plaintext authentication with CIFS is, I believe, a marginal use case anymore; I won't rule out the possibility of including a fix for this in an update to Ubuntu 8.04, but for reasons of security I would encourage you to look into moving away from plaintext passwords for your use.
Malte,
Please file a separate bug report for your issue, which is unrelated to the other issues discussed in this bug report.
Plaintext authentication with CIFS is, I believe, a marginal use case anymore; I won't rule out the possibility of including a fix for this in an update to Ubuntu 8.04, but for reasons of security I would encourage you to look into moving away from plaintext passwords for your use.