Fatal error: Allowed memory size of 268435456 bytes exhausted

Поробуй увеличить память в настроках php.ini

Увеличил память до 512M.

Теперь открывается просто белая страница, ошибок никаких не выдает: http://impulsefilm.ru/zvezdy.html

Try this:

http://www.mintjoomla.com/support/community-forum/user-item/4656-giorgi625/48-cobalt-8/6261-allowed-memory-size-exhausted.html

The memory allocation for PHP can be adjusted permanently, or temporarily.

Permanently

You can permanently change the PHP memory allocation two ways.

If you have access to your php.ini file, you can edit the value for memory_limit to your desire value.

If you do not have access to your php.ini file (and your webhost allows it), you can override the memory allocation through your .htaccess file. Add php_value memory_limit 128M (or whatever your desired allocation is).

Temporary

You can adjust the memory allocation on the fly from within a PHP file. You simply have the code ini_set('memory_limit', '128M'); (or whatever your desired allocation is). You can remove the memory limit (although machine or instance limits may still apply) by setting the value to "-1".

Google for "Joomla white creen of death" and fix this first. Then you will see the problem.