I tried the update on a Mac G3 233 with 160 RAM -- no virtual and saw no problems (other than the memory being set back to 32 M from 100 but that was an easy fix). No gamma change, so slow downs with volume renders. Now I am running the updated version on a Mac G4 450 with 64 RAM and 160 virtual RAM. Renders are significantly faster (even with volume materials and volume atmsosphere turned on). The new stars seem a little titchy about showing up when cumulous clouds are turned on (again, a minor complaint). Stratus clouds and stars works fine though.