I won't be at home at my computer until this afternoon, but for now here's all the info I can remember: -I have lots of groups already in the scene, and certain hidden objects so I don't think that doing this further will help. -I think that I have version 4.05 (I didn't do the latest update so I've pretty sure that this is right.) -This is the first time I've gotten this error, and it only comes up in this specific scene. -I don't think the error comes up after doing anything specific, but I've gotten it after applying a texture map to one of my objects, after trying to render, after applying a bump map.. -I'm running Windows ME with 256 MB of RAM Ok, that's all I can think of for now. Anything I missed? Any ideas what the problem could be? Thanks again for your help, Jenna