custom Thumbnail issue

Hi Folks,

Big issue with some of my thumbnails. I have a main Album and inside other Albums with specific thumbnails for which I use custom Thumbnail. Every day, some of those custom Thumbnail just don't show and are replaced with an image from the album itself. Pretty annoying, as I have no control on it. Is there any fix to that issue, or maybe a setting to change in the configuration.

Many thanks for your help guys

Michel

Gallery version = 2.2.4 core 1.2.0.6
PHP version = 4.3.9 apache2handler
Webserver = Apache/2.0.52 (CentOS)
Database = mysqlt 4.1.20, lock.system=flock
Toolkits = Exif, Ffmpeg, LinkItemToolkit, NetPBM, Thumbnail, Gd, ImageMagick
Acceleration = none, none
Operating system = Linux vps151.whitevps.com 2.6.9-023stab044.4-smp #1 SMP Thu May 24 17:20:37 MSD 2007 i686
Default theme = floatrix
gettext = enabled
Locale = en_US
Browser = Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en) AppleWebKit/523.12.2 (KHTML, like Gecko) Version/3.0.4 Safari/523.12.2