Conclusion? as soon as everything loaded, the Couatl menu disappeared. The only way I could make it appear again is if I restart Flight Simulator X and avoid San Francisco.
So, your problem doesn't have anything to do with the problem discussed here, which is the Couatl menu not loading at start. Instead, your problem seems to be that the program crashes ONLY at KSFO.
It's best if you open a different thread, with a proper title, because mixing two entirely unrelated issues will be very confusing for other users.
Create a new thread, and then post both your Couatl.LOG and Couatl.ERR files, after starting FSX and moving to KSFO. Enable logs in the "Troubleshooting" section of the "GSX Settings" page.