Hello Tim,
I accessed backend of your site > Global configuration > and enable Error Repoting. Then this error shows in frontend:
Fatal error: Allowed memory size of 25165824 bytes exhausted (tried to allocate 120 bytes)
Seems to be you’re running out of the allowed memory size.
If you have access to your php.ini you should look for a line that contains memory_limit and set its value to a greater value which works for you)
In case you can’t access the php.ini try setting it trough the .htaccess file:
php_value memory_limit 1000M
If that also fails you should contact your hosting provider. Some have a web interface to allow changing this settings. Unfortunately others doesn’t allow changing it at all, you need to ask them for help.
Regards