It seems that on the Retina Macbook the Backbuffer for the 3D engine gets corrupted. Whenever I try to slice it seems to grab random snaps of the current desktop. Most often its of a Finder window.
Aside from that, I'm loving Kisslicer. I run in it inside parallels from a windows image to work around the current issue.
Not sure what is needed to help troubleshoot the issue. If we can get this fixed, I'll go pro for sure. Primarily for the multiple STL feature.
I'm a huge open source fan, but I can see the hesitation to move Kisslicer to pure open source. Maybe a Pro+Source license option for an extra $10 on top of pro. Just a thought.