Hello, great ZenPhoto team!
I am visiting your site/forum, every day, so I will start this post with things I believe every post on forum should start with. (System info, ZenpPoto info and how ZenPhoto is installed)
(Unix) mod_ssl/2.2.22 OpenSSL/0.9.8e-fips-rhel5 DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/22.214.171.12435 mod_fcgid/2.3.6
Zenphoto version 1.4.3  (Official build)
Current locale setting: en_US.UTF8
Current gallery theme: custom (mix on default and zenpage themes)
PHP version: 5.3.10
Graphics support: PHP GD library bundled (2.0.34 compatible)
supporting: gif, jpg, jpeg, png, bmp
PHP memory limit: 96M (Note: Your server might allocate less!)
MySql version: 5.0.95
How Zenphoto is inhaled?
Classic method of installation, files sent to server via FTP, manually created SQL database, run setup.php...
Actually, current version is updated from previous version, and version before that... (About 2.5 - 3 years old site.)
I have problem with uploading images via Zenphoto back end admin panel.
When I try to upload image(s) with upload handler: http
after few seconds after click to start uploading I get: "500 Internal Server Error"
If I try upload handler: flash
I get "HTTP Error"
If I try upload handler: jQuery
Sometimes it looks like image is uploading, then folder where image should be uploaded opens with green note with "Your files have been uploaded."
But there is no that image in folder. And sometimes nothing is happening at all.
But it is not like that for all images I am trying to upload.
If I try to upload small size image ( about 50 kb) then everything if fine, image is uploaded no matter which method I use.
So, I tried to find out if I am getting problem related to image size in pixels (resolution of image), or it is problem related to actual size of image in bytes.
Then I tried to upload images in different resolutions and with some I had problems with some not.
For example I can not upload image in resolution 1600 x 1200 pixels, with size about 150 kb, but I can upload image in resolution 1920 x 1200 with size about 50 kb.
After testing, and testing, I found that problem is not resolution of image, it is size of image in bytes.
For example I can upload image in resolution of 2233 x 3654 pixel. I made that image, blank gray image, jpeg, with small size of just 127.08 kB (130.125 bytes)
But If I make that same image just little more bigger in size 130.191 bytes then I have problem with uploading that image.
So everything is fine up to 127.08 kb, any smaller image I can upload without any problem.
Also, it is important to note that I nave no problems with any image if I upload it via FTP, no matter if size is bigger than 127 kb. Image if found, resized, everything if fine then, problem is just uploading images using admin back end, and with images bigger than about 127 kb.
On upload page I can see this:
ZIP files must contain only Zenphoto supported image types.
The maximum size for your total upload is 8MB which is set by your PHP configuration post_max_size.
Don't forget, you can also use FTP to upload folders of images into the albums directory!"
Also my "upload_max_filesize" in php.ini is 32MB
If there is something I need to change in my php.ini file or something else, please advice.