I have a similar problem:
Following errors:
Maxfwd module- initializing 0(28433) mod_init(): Database connection opened successfuly acc - initializing voicemail - initializing 0(0) submit_query(): Unknown column 'user_agent' in 'field list' 0(0) submit_query(): Error while submitting query 0(0) preload_udomain(): Error while doing db_query 0(0) register_udomain(): Error while preloading domain 'aliases' 0(0) domain_fixup(): Error while registering domain ERROR: error ffffffff while trying to fix configuration
I don't see where the columns for the query are defined in the config. The change I made (and changed back) was to point SER at different DB machine.