Just another three cents.
You state you used a new 1.5.7c and a database from a year ago. Did you ever use the zc_install to upgrade the old database to meet 1.5.7c?
Just another three cents.
You state you used a new 1.5.7c and a database from a year ago. Did you ever use the zc_install to upgrade the old database to meet 1.5.7c?