Images Upload but using Add Media to Add an Image from URL stalls

I’m new to wordpress and like it a lot. Thanks to those who maintain it.

I have read the problems with the image uploader. For me, the uploader works, but when I try to use the Add Media buttons to add an image from a URL, it stalls. I’ve read the sticky and done everything that applies to my browser. I’ve tried various browsers. They all stall the same way.

I’ve checked it out as thoroughly as I can and I think that I’ve isolated what looks like a problem.

As near as I can tell, when I click on “Insert into Post” the following javascript should happen. I get it from wp-admin/includes/media.php.

<script type="text/javascript">
<!--
top.send_to_editor('<?php echo addslashes($html); ?>');
top.tb_remove();
-->
</script>

The send_to_editor javascript function that is called is in wp-admin/js/media-upload.js. I’ve done what I could to see if this file is actually included. It seems it is not.

I tried to figure out how that js file should get loaded and I discovered wp-includes/script-loader.php with this code:

$this->add( 'media-upload', '/wp-admin/js/media-upload.js', false, '20080109' );

Without having gotten into the intricacies of script-loader.php, I wondered if I was onto something here, but I’m getting more into it than I want.

I also noticed that the code after the above line was:

$this->localize( 'upload', 'uploadL10n', array(
                                'browseTitle' => attribute_escape(__('Browse your files')),
                                'back' => __('« Back'),
                                'directTitle' => attribute_escape(__('Direct link to file')),
                                'edit' => __('Edit'),
                                'thumb' => __('Thumbnail'),
                                'full' => __('Full size'),
                                'icon' => __('Icon'),
                                'title' => __('Title'),
                                'show' => __('Show:'),
                                'link' => __('Link to:'),
                                'file' => __('File'),
                                'page' => __('Page'),
                                'none' => __('None'),
                                'editorText' => attribute_escape(__('Send to editor »')),
                                'insert' => __('Insert'),
                                'urlText' => __('URL'),
                                'desc' => __('Description'),
                                'deleteText' => attribute_escape(__('Delete File')),
                                'saveText' => attribute_escape(__('Save »')),
                                'confirmText' => __("Are you sure you want to delete the file '%title%'?\nClick ok to delete or cancel to go back.")
                        ) );

If I look at other combinations of the add and localize methods there, should this be:

$this->localize( 'media-upload', 'uploadL10n', array(

I tried changing it and it doesn’t fix my problem, so these are just clues. I’d like to be able to add a video this way, but it just isn’t working.