I am using the CityEngine trial. It was working fine for a little while, but now when I go to start CityEngine, it shows the below CityEngine splash screen for a few seconds:

And then city engine closes. No error messages or anything. I recently received an email saying that my trial was 2 weeks until it was done, but that would not be related to this would it? I did try reauthorizing it but it said that all requested features were already authorized on this machine. I also tried a re-install of CityEngine.
Has anyone else have this problem or know how to fix it?
Many thanks in advance.
Caleb Byers