segfault after upgrading 1.7.2 to 2.0 - Help!

[eluser]TWP Marketing[/eluser]
My first suspicion is that your CI installation is corrupted.
Try a reinstall of CI.

Also, unless you have some overriding need to use CI 2.0, I recommend upgrading to the latest stable release, which is 2.1.2. There were some bug fixes which you should avoid by the upgrade. Unless of course you meant the latest version by "version 2.0"