Hello xxxxx,
First and foremost, thank you for downloading our app!
Unfortunately Apple has disabled HiDPI resolutions on all external monitors for the retina display Macbook Pro models. We did try to see if this could be resolved on our end, but since it's not supported by OS X on these specific models there isn't anything that we can change in our software to add this support.
We've submitted a bug report to Apple (Radar #11760839) and are waiting for a reply. We're hopeful that they will get this resolved soon. I apologize for the inconvenience.
Cheers,
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Drew
Customer Support
Avatron Software, Inc.