Thanks, Mark.

I've found that tip as well, and it allowed me to restore Carrara 6 to working order (I restored the old preference file from Time Machine - very handy!).

Half-way there.

But when I went to modify the Preferences.txt file in Carrara 7, the file had no "intf" setting at all. It's like it was incomplete. I uninstalled Carrara 7 and tried reinstalling it on the theory that maybe something went awry the first time, but still the "intf" setting was completely missing. So I tried simply adding it myself:

intf {
FONT "Helvetica"
}

But that didn't accomplish anything either. I suspect that my Preferences.txt file is incomplete in some other way as well, but I'm not sufficiently knowledgeable to figure out what is missing.

I wonder, would the Carrara 6 preferences file work for Carrara 7? Any other ideas?