Image Manager errors

[peter--01]

Hi,

This is my first post I'm new to CMSes in general and CMSMS, so please go easy on me. And I hope someone can help.

Running CMSMS 1.2.5.

When I open Image Manager, I see:

Not Found
The requested URL was not found on this server.

Then down at the bottom of the page there's the Upload File text box & button
and the Create New Folder text box & button.

So that's the first problem. The second problem is that if I do upload files, the permissions for the images are set to 664, and they don't display in Image Manager, of course. If I upload them using File Manager, I can see the images, but I still can't see them in Image Manager, and thus thumbnails aren't displayed.

Now I've searched and search and none of the old posts seem to solve this...

Safe Mode is OFF.
I confirmed the path to ImageMagick with my ISP. However it was wrong at first, and I think thumbnails still aren't being written even now.

These are some of the settings in config.php:

#Where do previews get stored temporarily?  It defaults to tmp/cache.
$config['previews_path'] = '/home/[EDITED]/public_html/tmp/cache';

#Where are uploaded files put?  This defaults to uploads.
$config['uploads_path'] = '/home/[EDITED]/public_html/uploads';

#Where is the url to this uploads directory?
$config['uploads_url'] = $config['root_url'] . '/uploads';

#Permissions for uploaded files.  This only really needs changing if your
#host has a weird permissions scheme.
$config['default_upload_permission'] = '664';
(so maybe the 664 wasn't a problem)

$config['image_transform_lib_path'] = '/usr/bin/convert';
(this is per my hosting provider)

#Default path and URL for uploaded images in the image manager
$config['image_uploads_path'] = '/home/[EDITED]/public_html/uploads/images';
$config['image_uploads_url'] = $config['root_url'] . '/uploads/images';

I did have Album, Lightbox, and CGExtensions installed, and I tried uninstalling them. No change. I also made sure eAccelerator was off by pasting some text into the .htaccess file, and that had no effect either.

Hope you can help!

Thanks,
Peter