Please Answer the following:
Version of Zen Cart?
Version of Ultimate (SEO) URLs?
Copy of .htaccess file?
Copy of
server error log?
Copy of any
Zen Cart debug file?
Typically "HTTP/500 Internal Server Error (or Internal Application Error), indicates a SERVER ERROR (either Apache/IIS, PHP, or another server module). This is a generic error telling you the Web Server itself encountered a fatal error in one of the Web Server's modules. Typical causes are: misconfiguration of the webserver, misconfiguration of directives in the .htaccess file, or the webserver not allowing a directive in the .htacess. There should be a "log" for
server side errors (unless disabled by your hosting provider).
However, in your case I'm going to guess something else is going on. Fatal errors are rarely based upon browser... And I cannot duplicate the issue while browsing your website... I can add an item to my cart (on your website) using Firefox and IE without encountering this error...
I have seen this error on your site (last night) but it was on a completely unrelated page (category page). It was once out of about 30 page refreshes. Now I am getting all "HTTP / 404" errors for your site... Do you have a location we can see the error?
Did you install using the Zen Cart distribution zip from
www.zen-cart.com (or did you use a one click install)? Is your hosting provider doing some sort of "caching", "proxying", or using a gridserver?
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