Thanks Jesse, however, I think I'm seeing a problem with iOS 6 devices (tested on an iPad 3 with iOS 6).
I upgraded to Charts 2.3.1b and it seemed to work fine on iOS 7, iOS 5, and the iPhone 5S, however, on iOS 6 I'm seeing a crash in GLIContextFromEAGLContext when the chart "initWithFrame:" is called.
Are you able to reproduce this on your end?
UPDATE: This issue with iOS 6 (now confirmed on two iOS 6 devices) is if the device is plugged into the debugger, then the crash happens as detailed above. If you unplug the device from the debugger and run the app without XCODE, then it operates normally.
I’ve cleaned the build, restarted the mac and the iPads, and still get the same reproducible behavior each time.