I installed zenPHOTO on my new site, and I could upload all my art, but I get an error trying to access any through the thumbnails. Here is an example.
192.168.1.101 - - [23/Jul/2015:01:49:56 -0700] "GET /zenphoto/index.php?album=all&image=Athena_Parthenos_Olympian_at_Olympus.jpg HTTP/1.1" 200 6169
[Thu Jul 23 01:49:57.443169 2015] [:error] [pid 11934:tid 139806260578048] [client 192.168.1.101:52827] PHP Warning: fopen(/srv/httpd/homesite/zenphoto/zp-data/debug.log): failed to open stream: Permission denied in /var/www/homesite/zenphoto/zp-core/functions-basic.php on line 1240, referer: http://davidchmelik.com/zenphoto/index.php?album=all&image=Athena_Parthenos_Olympian_at_Olympus.jpg
[Thu Jul 23 01:49:57.443272 2015] [:error] [pid 11934:tid 139806260578048] [client 192.168.1.101:52827] PHP Warning: imagejpeg(/srv/httpd/homesite/zenphoto/cache/all/Athena_Parthenos_Olympian_at_Olympus_595.jpg): failed to open stream: Permission denied in /var/www/homesite/zenphoto/zp-core/lib-GD.php on line 119, referer: http://davidchmelik.com/zenphoto/index.php?album=all&image=Athena_Parthenos_Olympian_at_Olympus.jpg
192.168.1.101 - - [23/Jul/2015:01:49:56 -0700] "GET /zenphoto/zp-core/i.php?a=all&i=Athena_Parthenos_Olympian_at_Olympus.jpg&s=595&cw=0&ch=0&q=85&wmk=%21&check=555628589e611bb5079041a73fde718ef4010aca HTTP/1.1" 302 -