Embeded Form Collection doesn't remove item Symfony2 - php

Question

I have a strange problem. I'm working on a Symfony 2 based web app and I embedding a from collection to another one based on the Symfony Cookbook entry (This: http://symfony.com/doc/2.3/cookbook/form/form_collections.html ).
Recently I changed my bundle's mapping data to annotation from yaml.
The problem starts here. Persisting new elements works fine, but I can't remove anything.
I have a Page entity and an Image entity and they have a many to many relation. I embed and image upload form collection to the Page's form.
The old mapping was invalid, the new one is valid but doesn't work.
Here are my old and new mappings:
old yml:
page:
manyToMany:
images:
targetEntity: Image
inversedBy: page
cascade: [persist, remove]
orderBy:
image_order: DESC
no mapping on the image
New mapping:
Page:
/**
* #ORM\ManyToMany(targetEntity="Image", inversedBy="pages", cascade={"persist", "remove"})
* #ORM\JoinTable(name="page_image",
* joinColumns={#ORM\JoinColumn(name="page_id", referencedColumnName="id")},
* inverseJoinColumns={#ORM\JoinColumn(name="image_id", referencedColumnName="id")}
* )
* #ORM\OrderBy({"image_order" = "DESC"})
*/
protected $images;
Image:
/**
* #ORM\ManyToMany(targetEntity="Page", mappedBy="images")
*/
protected $pages;
The action that handles the edit form submission:
/**
* Edits an existing Page entity.
*
* #Route("/{id}/update", name="page_update")
* #Method("post")
* #Template("AdamantiumBackendBundle:Page:edit.html.twig")
*/
public function updateAction($id)
{
$em = $this->getDoctrine()->getManager();
$entity = $em->getRepository('AdamantiumBackendBundle:Page')->find($id);
if (!$entity) {
throw $this->createNotFoundException('Unable to find Page entity.');
}
$editForm = $this->createForm(new PageType(), $entity);
$deleteForm = $this->createDeleteForm($id);
$request = $this->getRequest();
$editForm->handleRequest($request);
if ($editForm->isValid()) {
$em->persist($entity);
$em->flush();
apc_clear_cache('user');
return $this->redirect($this->generateUrl('page_edit', array('id' => $id)));
}
return $this->render('AdamantiumBackendBundle:Page:edit.html.twig',array(
'entity' => $entity,
'edit_form' => $editForm->createView(),
'delete_form' => $deleteForm->createView(),
));
}
The embeded collection from the Page form:
->add('images', 'collection', array('type' => new ImageType(),
'allow_add' => true,
'allow_delete' => true,
'by_reference' => false,
'options' => array('data_class' => 'Adamantium\BackendBundle\Entity\Image'),
))
I have the add and remove Images methods, I have getters and setters. (and as I said earlier everything worked fine with the invalid yml mapping)
So please tell me what am I missing or what do I do wrong.
Thanks!!