Scheduled Maintenance: We are aware of an issue with Google, AOL, and Yahoo services as email providers which are blocking new registrations. We are trying to fix the issue and we have several internal and external support tickets in process to resolve the issue. Please see: viewtopic.php?t=158230
All you can do is use Reportbug to notify developers and just keep it on 24hr clock.
Unlikely to get fixed in stable.
Im on cinnamon desktop and this doesnt happen,so it looks as though its an xfce bug.