Retina Macbook Pro Scaled Resolutions all screwed up!

HI all,
I've tried everything, but my MacBook Pro's scaled resolutions are all screwed up. I usually use the second from the right (see screenshow below) however now selecting that resolution switches the display to 1024x640 (HiDPI). So instead of more space, I get significantly less than the standard retina resolution, which is really odd.
In addition to this, the highest scaled resolution is now 1440x900 (HiDPI) resolution, which is the standard Retina resolution! So there's no difference bewteen the middle setting and the one on the far right.
Screnshot: http://cl.ly/image/03311Z1I1L2r
As you can see, I have the max scaled resolution selected, but it's displaying at 1440x900.
I tried resetting PRAM, and trashing the com.apple.windowserver.plist file, but no dice.
If anyone can help I'd really, really appreciate it
Many thanks,
Marcel

Fixed it. Looks like I'd accidentally deleted some files from /System/Library/Displays/Overrides while trying to get an external display to work correctly.
To fix the issue I copied all the overrides from a friend's Retina Macbook Pro, and placed them into my overrides folder. Worked like a charm.

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