When I try to edit the forum home template to insert some code I get an internal server error. This doesn't happen on the other templates I've had to edit.

Solutions I've tried

• .htaccess file if "Mod_Security" is installed on my web host server.
  
• All folders are CHMOD to 755 and files to 644.
  Demonstration of the problem:
  

http://www.techyforums.net/problem.gif


I've posted this on the vB support forums too. If I get a solution I'll update it here, it will be useful for future reference.