It should add it.
Were there any errors that it couldn't be run.
The problem is that we had a U_BirthDay field from the old mod - the the 6.4 altertable fails on the whole query when it tries to add a bunch of new stuff.
I can help you get it fixed - but right now I get "forbidden" errors.
If you've got PhpMyAdmin - PM me with access and I should be able to get you all fixed up.
I think that some fields didn't get properly added when you did the 6.4 upgrade.
