Problems with screen grabbing on retina Macs

[QualityApplications]

Hi, my plan was to buy a Mac mini and attach it to my TV one day. So the lightpack was lying around all the time till yesterday when my plan changed and I liked to run the lightpack with my retina iMac. Unfortunately I've got issues with the screen grabbing feature. Maybe the software doesn't work with retina displays? I tried the lightpack on Mac OS 10.11.2 on both a retina iMac and a MBPr. Both have problems grabbing the correct border color. I've got Bootcamp on my MBP and the lightpack does work correctly under Win7.

Since I'm a software developer myself I could modify the software but before delving into your code are there any known issues? I can't say the exact problem but maybe the grabbing has problems with points and pixels and does calculate the colors just from the upper left part of the screen?