[eluser]jmadsen[/eluser]
It sounds like a system configuration problem, not a CodeIgniter one. You really aren't giving us much info to help you with.
You should talk to your host provider or sysadmin for your server. If they can't help you, seek out a forum that deals with either fckeditor or general web server issues.
It's unlikely you'll get much help from here, unless someone just happens to know from past experience