I just imported the mesh that caused this problem yesterday - opened fine, no problems.
Seems there's a new issue with every new scene :) lol

For instance, today checking the "depth of field" option crashed firefly 5 times in a row, but by unchecking it the render completed without issue....not sure this is a bug.... just another irritation. I'm gonna restart and try the same scene again to see what happens :)

thanks for the reply Spanki