I don't get why my model isn't saving - assistance requested

I'm trying to do something relatively basic. I'm using the restful authentication plugin, so I have Users, and I also have Tasks which belong to a user:

class User < ActiveRecord::Base
   has_many :assigned_tasks, :class_name => "Task", :foreign_key => "assigned_to"
   has_many :created_tasks, :class_name => "Task", :foreign_key => "created_by"

class Task < ActiveRecord::Base
   belongs_to :creator, :class_name => "User", :foreign_key => "created_by"
   belongs_to :user, :class_name => "User", :foreign_key => "assigned_to"

I'm using Rails 2.1.1 so I'm doing this in the view:

# new.html.erb
<% form_for @task do |f| %>
... fields
<% end %>

But the application posts to the index action, not the create action like it's supposed to; even if I try to post a blank form, when errors should be raised, it's posting without raising any errors whatsoever. The new action in the controller reads like this:

def new
   @task = @current_user.created_tasks.build

and here's the create action:

def create
   @task = @current_user.created_tasks.build(params[:task])
   if @task.save
     flash[:notice] = "Task was created"
     redirect_to task_path(@task)
     render :action => 'new'

Can someone let me know what I'm doing wrong? Should I not be creating the task with build? I thought I was getting pretty decent with the basics of Rails, but I guess not because something this simple is tripping me up.

Okay... I have no idea what the problem was, but it seems to be
working right now.

if you do task.save! it should show you where it fails

I had the same problem, restarting the server helped.