Originally Posted by Rick
What this could be is the mod_security feature being enabled by the web host.


In ran into an issue once with that mod_security feature and I could solve it with an addition to the .htaccess file.

https://www.ubbcentral.com/forums/ubbthreads.php?ubb=showflat&Number=193147#Post193147


[Linked Image from siemons.org]