I'm having the same problem described in [url=http://silverstripe.org/dataobjectmanager-module-forum/show/9150]this[/url] thread using the [url=https://github.com/ajshort/silverstripe-memberprofiles]memberprofile[/url] module. Tried that patch, but it does not work. Because the mentioned thread is quite old, I hope someone has figured out a solution already.
EDIT: Never mind, solved it myself. Found the correct place to apply the mentioned patch.