I've found alot of the errors are due to the realtime rendering. If saving the file and reopening it is fixing it then that might be the culprit. Are you using opengl? I found that there is a slowdown in the VM with opengl because of the old memory leak, which hopefully will be fixed in version 4 whenever that comes out. Also, opengl seems to have problems with certain objects, and will crash or freeze the Carrara. Make sure to report every error you get to Eovia. They are good at fixing things and helping with workarounds if you let them know. Brian brian@vizualds.com http://www.vizualds.com