Viveza2 problem. Started playing around with this program. More times than not it freezes up. Cannot save or cancel the changes made. Cannot exit out of it or Aperature3. Forced quit required. All changes lost. Have yet to uninstall & reload. Any other suggestions before I contact NIK? Hardware is iMac 10.6.7 with 2.5GHz Intel Core i5 & 8GB of SDRAM. HDR Efex Pro. For this specific HDR program at what EV bracket ranges do you normally shoot at & how many images for: 1. High contrast bright sunlight conditions; 2. High contrast night scenes; 3. High contrast, but softer lighted conditions (eg. the "magic hour). Final image desired is something closer to what the human eye visualizes. Not some over the top HDR effects image. New & inexperienced to the world of post image processing. A3 & Nik is definitely much nicer (except when V2 freezes) than iPhoto and PSE3.