hi every one, I have also problem with rendering my file. It is big file, a tower, I tried to delete objects as much as I can but not much helpful. It so weird sometimes rendering but mostly caused my PC hang and even cannot shut down. mostly I have to press and hold power button to restart computer. I tried copy it and paste in new sketch up file, purge, explode those groups with many components or subgroups but still the same. Since it is for on going project, seriously I need ur help.