I was messing around with Torcs and SD, trying to get newer versions installed, and borked my system (Ubuntu 11.10).
I had a hard time trying to find answers to what had happened. Finally I removed the $HOME/.torcs folder and the /usr/games/torcs folder and "voila" no more segfaults.
I hope this gets to the search engines so that anyone having this problem will find out why.
Error: error 4 in libconfscreens.so
Update: I accidently copied a SD car into the Torcs cars folder. That is what messed things up!