Joomla - Gallery 2.2-RC-1 and integration: Thumbnails not displaying?

My thumbnails are not showing up in the gallery when I'm integrated with Joomla 1.0.12 and/or Drupal 5.x (so I don't think it's the bridge alone).

Any ideas? This started happening when I upgraded to the RC1 version and now I can't roll back. ; )

Gallery version = 2.1.2 core 1.1.0.2
PHP version = 4.4.1 isapi
Webserver = Microsoft-IIS/5.0
Database = mysqlt 4.0.18-max-nt, lock.system=database
Toolkits = Exif, Thumbnail, Gd
Acceleration = none, full/86400
Operating system = Windows NT MEGALOMANIA 5.0 build 2195
Default theme = classic
Locale = en_US
Browser = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6

I'm confused. This should be PHP 4.4.5?

Gallery version (not just "2"): Gallery 2.2-RC-1
PHP version (e.g. 4.3.11): 4.4.5
PHPInfo Link (see FAQ): http://www.louipimps.com/gallery/phpinfo.php
Webserver (e.g. Apache 1.3.33): IIS 5
Database (e.g. MySql 4.0.11): 5.0.27
Activated toolkits (e.g. NetPbm, GD): GD2
Operating system (e.g. Linux): Windows 2000 Advanced Server
Browser (e.g. Firefox 1.0): Firefox 2.0.0.1

I changed from Datbase to File locking and it seems to be working better?