G'day Bruce,
I have the same problem and the thread gives the suggestion of perfoming a backup, doing a full install and then restoring from backup.
My question to the forum is: can you restore a backup made from SME 5.1.2 onto a new install of 5.6 using desktop backup? I really need to confirm this will work before I cream my server as it has been so robust.
Cheers all,
Andrew