I'm experiencing an error with ImageDataObjectManager that I can't work out. I'm using the same code on my development server (Windows) and live server (*nix). Code works on dev server, but not on live server.

Using an ImageDataObjectManager to add photographs to a page. After choosing existing image(s) I click continue. In the Editing file 1 of 2 page the image isn't show. The image not present icon is shown in editor.

I expected it to be an issue with rights in the assets folder, but if I click on one of the images that failed to add, I can then select the image successfully using the Image selector in the popup and a thumbnail appears (on resizing the thumbnails, they are correctly re-generated).

For what it's worth uploading a file through ImageDataObjectManager doesn't work either. However, uploading through Files & Images with DOM does work on both dev and live without issues.

Any clue to what the solution could be is appreciated!

	static $has_many = array(
			//
			// snip
			//
		'Images' => 'ImageResource'
	);


	function getCMSFields() {
		$fields = parent::getCMSFields();
			//
			// snip
			//
    $fields->addFieldToTab("Root.Content.Photos", new ImageDataObjectManager(
			$this, // Controller
			'Images', // Source name
			'ImageResource', // Source class
			'Image', // File name on DataObject
			array(
				'Name' => 'Name',
				'Description' => 'Description',
				'Maker' => 'Maker',
				'Email' => 'Contact email (auto anti-spam)',
				'Rights' => 'Free to publish?'
			), // Headings
			'getCMSFields_forPopup'
		));
			//
			// snip
			//
		return $fields;
	}

<?php
class ImageResource extends DataObject {
	static $db = array (
		'Name' => 'Text',
		'Description' => 'Text',
		'Maker' => 'Text',
		'Email' => 'Text',
		'Rights' => 'Boolean'
	);

	static $has_one = array (
		'Image' => 'Image',
		'Species' => 'Species'
	);

	public function getCMSFields_forPopup()
	{
		return new FieldSet(
			new TextField('Name'),
			new TextareaField('Description'),
			new TextField('Maker'),
			new TextField('Email', 'Contact email (auto anti-spam)'),
			new CheckboxField('Rights','Free to publish?'),
			new FileUploadField('Image')
		);
	}

	function onBeforeWrite() {
		$this->Email = str_replace(array("@", "."), array("(at)", "(dot)"), $this->Email);
		parent::onBeforeWrite();
	}

}

Using latest versions of both DOM (commit: dc7bb4...) and uploadify (commit: 1254c6...)