This annoyance happens when I am in Iray preview mode with only one character in the scene and nothing else...simple hair. Then I start adding different spot lights one at a time to test the lighting...as I start loading the lights one by one initially nothing happens...until I load the the third or fourth light...BOOM!...crash time!...

I have to constantly save my work every couple of minutes because of this terrible ordeal!...

Rendering itself is not a problem at all...can go on hours rendering very complex scenes without Daz crashing at all...its only when I use the preview mode.

And buying a brand new powerful graphics card with tons of Ram is totally not an option at the moment...