During installation, adding a user will add them to the following groups:
audio video cdrom dialout fuse users
When adding a new user via the DE's respective control center it does not add them to the correct groups automatically.
$ groups temp temp : temp $ groups ninya ninya : ninya dialout audio video cdrom users lpadmin scanner plugdev fuse sudo
This means that certain functionality does not work for new users added to the system (like audio!)