samba - Nov 2007 - Machine account LCT field not updated in smbpasswd 3.0.26a/Solaris

I posted a message some weeks ago with no answer about the problem that
after re-inserting a machine in the samba domain, the smbpasswd
LCT field is not any more updated.

- the machine NT password hash is updated but LCT no.
- this problem does not occur when updating a user password
- this problem does not seem to be OS dependent since the problem is the
same on Solaris and SLES (compiled by me with same options)

Does any one have an idea on what's going wrong ?

Thank you for your help