Apparently the container theme does not support #id, so it must go in #attributes.
Fixed a notice caused by a bugfix in Fieldgroup. See: #2298371: Error Message when using the module with the user Account Page & #2037731: Remove id attribute from HTML elements
SA-CONTRIB-2014-069 - Logintoboggan - Access Bypass and Cross Site Scripting (XSS)
Fixes for a couple of security issues:
#103928 - Failure to unset the auth role for users with pre-auth role on 404 pages. #106048 - XSS vulnerability in Unified Login form.
First stable release.