Rails - Mar 2010 - switched to a has_many :through, now User can't be blank error

I just changed from a normal has_many :blogs, belongs_to :user
relationship to a has_many through relationship.  I created a new
model (subscription) and belongs_to''d it both blog and user, and set
up their has_many :subscriptions and their respective through
association.  However, now when I go to create a new blog, I keep
getting a "User can''t be blank" error.  In my blog''s
create action,
I''m doing:

current_user.blogs.create

Is that the problem?  Somehow the current_user''s id isn''t
matching up
to the user_id column in the subscriptions model?  It mapped correctly
before.  I thought I might not have to pass in the current user, so I
tried:

Blog.create

but I got the same error, "User can''t be blank".
I then thought maybe I had to allow its attr_accessible for some
strange reason, but still no dice.  What am I doing wrong?
Big thanks in advance.

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