Izuel - have you downloaded the patch from www.eovia.com? I believe it's supposed to fix some of the errors. I know this doesn't help you now, but maybe in the future =) The only time that I have ever received an Unknown Error is in the render room. And I haven't gotten any since I patched it. Sorry about you losing your model! I'm just starting with vertex modeling and I know what a pain it can be, you might want to try rebooting and then opening Carrara again. Well, good luck to you! Hope you can get your model back! rockjockjared