I am working on a template that uses K2 and I'm having some major issues.

The website's URL is candlerprobate.org/CCTest/. There are 3 items on the Home page. I only have 2 up because when I click on the title of the third one to edit it, I get an HTTP 500 error - "This page cannot be displayed." I've tried to delete the item and copy one that works, but when I do that, I can't even enable the new one.

The second problem I'm having is with the JoomlaWorks Image Gallery Pro that I had to purchase to use with K2. When I browse for my compressed image galleries (more than one item has a gallery), then click on Save, nothing happens. The images aren't there. The last time I tried, I got the HTTP 500 error again.

I've uploaded a php.ini file to my server that looks like this:
upload_max_filesize = 128M ;
post_max_size = 128M ;

What else am I suppose to do? Are there any Joomla settings that I'm unaware of that need to be set?

Not sure about the 500 errors, could be anything. If you create a completely new item and assign it to a menu what happens?

sigpro is designed to be use 2 ways
tags in content pointing to galleries
and the default way
the k2 gallery tab in the item
all images should be zipped into one folder and let k2 upload, unzip, resize, rename, and put them where it wants them

The items aren't assigned to menus. They're on the Home page as categories. This is my server log:
[Fri Feb 15 14:16:18 2013] [error] [client 24.122.152.76] File does not exist: /home/candl23/public_html/favicon.ico [Fri Feb 15 14:16:17 2013] [error] [client 24.122.152.76] File does not exist: /home/candl23/public_html/favicon.ico [Fri Feb 15 14:16:12 2013] [error] [client 24.122.152.76] File does not exist: /home/candl23/public_html/favicon.ico [Fri Feb 15 14:15:29 2013] [error] [client 24.122.152.76] File does not exist: /home/candl23/public_html/favicon.ico [Fri Feb 15 14:10:00 2013] [error] [client 216.119.20.85] PHP Warning: htmlspecialchars(): Invalid multibyte sequence in argument in /home/candl23/public_html/CCTest/libraries/joomla/form/field.php on line 510, referer: candlerprobate.org/CCTest/administrator/index.php?option=com_k2&view=info [Fri Feb 15 14:08:03 2013] [error] [client 216.119.20.85] File does not exist: /home/candl23/public_html/CCTest/templates/theme1295/admin/presets/theme1295.png, referer: candlerprobate.org/CCTest/administrator/index.php?option=com_gantry&view=template&layout=edit&id=1