[Solution] Extending libraries: proper locations for the Classname and MY_Classname library files

[eluser]pistolPete[/eluser]
Extending a class using the MY_ prefix is reserved to core classes only: http://ellislab.com/codeigniter/user-gui...asses.html

If you need to extend a library which resides in ./application/libraries/ you either need to autoload the base class or use standard PHP require().