Like Darotweiler above, I too get the 500 error if I add the following in my .htaccess file.
Code:
php_value max_input_time 600
php_value max_execution_time 600
php_value post_max_size 200M
The answer given was to edit the php.ini - but I don't have access. So what can I do? I've tried to follow this thread and one referred to in the thread, but nothing I put in the .htaccess works.

Thanks.
Michael