Can be two things,
if running under mod_perl restart your server
if not, then when you created the new column you asigned it ANOTHER name in the form field. Make sure you use the original name and do not add an alternate, resyn your def files and try again.
if running under mod_perl restart your server
if not, then when you created the new column you asigned it ANOTHER name in the form field. Make sure you use the original name and do not add an alternate, resyn your def files and try again.