Sometimes the magic quotes can generate a 500 internal server error in your LiveHelp Server Installation.
You have two options to fix this issue:
If you want to turn magic quotes off putting "magic_quotes_gpc = Off" in a php.ini file under public_html will disable it for GET/POST/Cookie data.
As an alternative solution, you can edit your .htaccess file by adding the code php_flag magic_quotes_gpc Off.
Also we find that sometimes you can get this issue when you have short paths in the Joomla configuration file.
The solution is very simple, change the danged paths to the full path on each of them, so instead of var/www/html we used the *COMPLETE* path. Same as is used in the path to tmp folder, without the tmp.