Becouse of the
attr_accessible :profile
I think, but if I dont have that line I cant enter values for profile,
Anyways. when I take that line off, my profile forms isn't validated,
this problem come when changing to rails 3.0.7
Try changing your mass-assignment protection line to:
attr_accessible :profile_attributes
If that still doesn't work send your view code. If you haven't
already ready read the nested attribute docs, they explain things
pretty well: ActiveRecord::NestedAttributes::ClassMethods