Do you have mod_security installed on your web hosting?
Added: 10.02.2011 11:33:18 Last updated: 11.10.2016 11:07:52
Yes, this is installed to work as a extra security for script on your web hosting. Mod_security prevents known breaches in script to be used for hacking your website.
Sometimes mod_security works "to well" and effects the functionality of a script. This is typically for uknown scripts. In these cases contact support and inform them you would like mod_secruity turned off for the account in question. You cannot turn this of yourself via .htaccess file at we are running on versionv 2.x.