DB_DataObject -- NO TABLES -- message

Hi, I have a slightly odd problem here, hopefully with a very simple solution :-) I developed on my local Windows computer using DB_DataObjects and uploaded the site to a FreeBSD server. It runs perfectly. Now I have added another table to my database, and so need to regenerate the base classes. However, every time I run the script to do this it tells me no tables exist in the database! The site works fine, so the connection details are blatantly right; and turning up debugging shows that the generate script is connecting to the correct database. Any ideas? Peter