Be careful saving files after getting "unknown error has occurred" I usually "save as" if i get the option, just to make sure the error doesn't get written into my file. I'd rather lose the last hour, than all week.

save as frequently, as carrara tends to still do strange things from time to time. at the end of a project, i usually have 15 or so copies of the file. you can never be too safe.

-pix