I've been searching posts, and it looks official: On the newest (late 2013) Macbook Pros, Apple added OS-X drivers for 4K resolutions, but NOT 2,560 resolutions. I only saw one post of someone who claimed they tweaked the OS-X driver to obtain this, but no details. Multiple posts confirm that this is out of SwitchResX's hands - they can't bypass the driver. Does anyone have a proven solution to 2,560 resolutions over HDMI? This is critical for me, so I can enable HDCP and watch movies on my external monitor. Thanks, great Mac users! - Jeff P. S. PuhLEEZE - no more posts stating the abilities of HDMI 1.3/1.4. We know it *can* do 2,560 - we just need to know how to enable it under OS-X. Thanks.