Suddenly Cannot Upload Photos To Established Album

The following information is required to get an answer:
Get this information from the PHP diagnostic (in the configuration wizard).
Gallery URL (optional but very useful): http://www.384thbombgroup.com/gallery/TheJokerCrew (URL of the offending album)
Gallery version: 1.5.9
Apache version: Apache/2.2.11 (Unix) PHP/4.4.9 mod_ssl/2.2.11 OpenSSL/0.9.8c mod_fastcgi/2.4.6 DAV/2
PHP version (don't just say PHP 4, please): 5.2.6
Graphics Toolkit: ImageMagick
Operating system: Linux wario 2.6.24.6-p4-modules-peon-grsec #1 SMP Thu May 15 22:08:43 PDT 2008 x86_64
Web browser/version (if applicable): Firefox 3

Today I identified the following problem in a user-created album. Note that the problem-causing event may have occurred much earlier (a month or more), but I just noticed it today. I first noted that there were 4 orphan files, so following the normal procedure, I clicked the button to delete them (after backing upt that album to my local computer, to preserve the files).

I am now unable to upload files to this album. I created a subalbum to this album and cannot upload files to it. The error message I get in both cases (regular applet) is:

Brown_interrogatoire.jpg: Error: Server contacted, but Gallery not found at this URL ( http://www.384thbombgroup.com/gallery/gallery_remote2.php )

I am able to upload photos in (at least) some other albums that are not associated with the offending album.

I copied all the photos in the "bad" album to another new album (on the Gallery server) and then tried to upload the missing files to this album - got the same error.

What do I have to do to repair the situation so that the user can continue to maintain this album?

Thanks,
f3

More ----

Got the following after copying all photos to new album, and using the Form method to upload photos: Fatal error: Call to a member function getRawDimensions() on a non-object in /home/prelleru/preller.us/384thBombGroupWebsite/htdocs/gallery/classes/Album.php on line 1427