Mine is macbook pro mid 2009 version, with 2 graphic card NVidia GeForce 9400M and 9600M GT attached with energy saver preferences set to higher performance. Well sometimes I also experienced sketchup quit unexpectedly or not responding but it occurs when I open more than 2-3 big skp files (approx. >60megs) while also running Autocad 2012 or Photoshop at the same time.