Since yesterday, I have been unable to change the difficulty when I select a Strike from the planet map. I select a strike, and the destination appears on orbit with the Launch button, but there is no button to adjust difficulty, so I can't set it to Heroic mode for the bounty. My character is level 27. I've tried logging out of PSN and logging back in then relaunching Destiny, but nothing seems to be doing any good to get my strike difficulty select back