Is UPS working happily otherwise? Its the worst part of SharePoint and they've made massive improvements even after SP1 so patching might be needed. For all things UPS you should check Spence Harbar's blog.
by bronyx85 at 2013-03-12 08:01:29
Yes, UPS is working fine. its importing users from AD fine.
But I just need to add extra fields to some of the users , and this extra data lives in a SQL table (i.e a FBA table).