I wanted to make a quick broadcast to third party developers about a potential issue in the upcoming ExpressionEngine 2.1 release with your add-ons, depending on how you were building file paths with CodeIgniter. If affected, your add-ons will break in ExpressionEngine 2.1, so it is very important for users of your add-ons to have updated code prior to its launch. If you have been building your file paths with PATH_THIRD or APPPATH*, you should not be affected.