my lighting setup is very simple… I use physical sun for exteriors (as I’ve noticed that HDR is quit obsolete if you have a good sun model…) and also for interiors (with some emitters in the windows and some in weak spots etc.) so the best workflow is to use something like MR Fire (=ipr?) with a directional light, which is very easy to setup using the eye-target manipulator (“t” shortcut). this way you get good sun light in seconds, and if you’re not happy with it, you can play a bit more and after 5 minutes or less you have a photo realistic perfect lighting. regarding the ipr crash, I think it’s not Bella’s fault as I’ve loaded a few older scenes that were created with Maxwell so maybe it causes a crash …?