To get rid of the HC thing here's how.
1. You will need to download this (if not already); http://www.mediafire.com/file/odumvrnl2l5cq1j/HabboUI+Editorv2.4.5.rar
2. Open your habbo.swf with it.
3. In the layout section find grid_purse, and in all of that code replace it with this;
<?xml...
If its the floor plan messing up, run this; ALTER TABLE `rooms` CHANGE `allow_pets` `allow_pets` INT(1) NOT NULL DEFAULT '0', CHANGE `allow_pets_eat` `allow_pets_eat` INT(1) NOT NULL DEFAULT '0', CHANGE `room_blocking_disabled` `room_blocking_disabled` INT(1) NOT NULL DEFAULT '0', CHANGE...
If he's just added this fix, then it's something to do with that either his emulator or something about this auth_ticket. Unless the client wasnt working for him before.