Well, well, well. I finally encountered the same problem on my Mac Pro rather than my laptop. The dialogue box claims it has something possibly to do with bucket sizes and adaptation vis a vis memory. But with 4 gigs, ya kinda wonder what's really up. I guess it could be the SR1. And thanks for the warning about Vue 6.1. I was about to buy it to do (among other things) some rendering. Now I'll wait a week or two.