We will be pushing a patch live tomorrow. Players will be returned to the title screen from their activities and then be required to log in to Destiny again after installing the patch.
I'm trying to play a Raid on hard mode but I'm unable to access it.
In order to access a Raid on hard mode, you must first complete the activity on normal. However, you may enter hard mode raids with a Fireteam as long as you are not the Fireteam Leader.