How do I fix this Header Problem ?

[eluser]CroNiX[/eluser]
The only IDE I use is Zend Studio, which is built on top of Eclipse. There are others that have stepping debuggers, of course, but I can't really list them as I don't use them or want to waste time checking out other IDEs as I've been using this one for 6 years now.

As far as why there is a difference between your dev/live servers, most likely it is some config setting such as error reporting. Do you use the ENVIRONMENT settings in CI? Is your live server set to suppress outputting of errors in your php.ini as well as CI as well as having a more strict error reporting level set?