i ran the import script as per the build guide. i am guessing something went wrong... i would have expected may be 22/23 error as that seems to be fairly common, if you do an update just after the schema changed...
my DBDefs.pm file refers to schema 23, so looks ok.
after dropping the old database i recreated it -
./admin/InitDb.pl --createdb --clean
then ran import script
./admin/InitDb.pl --createdb --import /tmp/dumps/mbdump*.tar.bz2 --echo (path was different to where i saved the bz2 files)
i used the mbdumps from the 10th of december
the server does work, but the replication script fails.