It seems that this problem described in some previous posts in this forum still exists. For instance, an uploaded file with the following name "Copy (2) of Copy of HPIM0421.JPG" causes zenphoto to not generate a thumbnail for it and an attempt to view this image brings up an illegal character error when mod_rewrite is enabled. Does anyone have a workaround for this?

Can you provide us with an url? the last thumb on http://testalbum.sbillard.org/unpublished/ points to a file named Copy of IMG_0233.jpg. The thumbnail displays fine when I view it.