There is an unsolved issue in extension NewSignupPage:
If the user doesn't check the terms checkbox there is no message appearing.
(I have set up a message at Mediawiki:shoutwiki-must-accept-tos)
This happens since the update to MW 1.19.7 - see this thread here.
Just tested it with MW 1.23.1 and there is still no massage appearing...
Should I file a bug or can anyone help here directly?
Thanks.