One of my computers is running ABAQUS on a 64-bit Opteron computer running Redhat Enterprise Linux (RHEL) v4. When I applied the latest set of Redhat patches, it noticed that CAE did not start anymore. The error message I got was:
/opt/abaqus/6.6-1/exec/ABQcaeK.exe: /opt/abaqus/6.6-1/External/libgcc_s.so.1: version `GCC_4.2.0' not found (required by /usr/lib64/libstdc++.so.6)

This problem can be fixed by taking the following steps...

Backup the files: libgcc_s.so and libgcc_s.so.1 as follows:

# cd /opt/abaqus/6.6-1/External
# mv libgcc_s.so libgcc_s.so.BACKUP
# mv libgcc_s.so.1 libgcc_s.so.1.BACKUP

Then CAE should work again.