I am having the same problem with the "JA_Coach" (quickstart) template.
After creating a user, I also get this error message: "Save failed with the following error: Data too long for column 'ip' at row 1".
The user is created anyway, but when I try to login in the frontend, I get to the profile page.
I guess the error is somehow related to: "You do not have a token yet. Please save your user profile to generate a token. Come back to this page to view and manage your token." .. this seems to be the problem, when the user creation is not really working. Same message in the frontend, when trying to save with the acceptance of the "website privacy policy".