please help , i cannot figure this out. Im using ZP 1.08

some thumbnails do get generated, others do not

try clicking any of the thumbnails on this page:

http://www.uodivisi.com/gallery/spring2007/

Please read:
http://www.zenphoto.org/2008/08/troubleshooting-zenphoto/#10
http://www.zenphoto.org/2008/08/troubleshooting-zenphoto/#11

Also consider upgrading since 1.0.8 is really outdated.