We're getting reports that people with accented characters in their names are having difficulty signing up for Trello.
Due to a bug in one of our underlying libraries, if you have a special character in your name and try to create an account, there's a mismatch and the authentication fails. We've reported this bug to our authentication library provider and hope they'll be able to resolve it in the next few days.
You can still sign up for Trello! Just use the normal signup option. We will temporarily convert any characters in your full name to ones that won't run into the bug, and you'll be able to change it back later, once the bug is fixed.
The launch of Trello has been immensely popular, and we can say for sure that this is only the first of the bugs we will eventually find. Thanks for bearing with us!