I don't know own if it's coincidence or not, but I dropped a 3oc last night. Played 4 hours of Public Events only just to see what happens. I didn't even get a blue. Every time. Just jumping from planet to planet event to event. My only reward each time (and almost all were heroic) was a token from the loot chest. Some random kills got me a blue but nothing from the chest. Playing today with the Vanguard Bright Paragon and it's business as usual. No exotics yet but some purples doing strikes. Just tokens and blues from Public Events. Been going for 2 hours now.