I can create an error 500 internal error by simply:
1. Installing the app
2. Installing the GrayScale theme
3. Changing the user questions to match what I want
4. Signing out.
5. Attempting to create a new account.
When I follow the link to the verification site, I get a 500 error --and I can't get out of it. I can't get to the admin site, or any other page, no matter what I do. The only solution seems to be to remove the software and reinstall.