Since the patch I have seen numerous cases where there were two pieces of loot on the final boss. However, if the first piece is awarded before you roll on the second one the popup goes away. Eventually it times out and gives the loot to the folks lucky enough to roll but you are SOL. In my last run one person managed to roll and won with a 7. The rest of us didn't get a chance to roll.
I've seen this happen as well, but in our case nobody got to roll on the second item. We had to wait until it timed out and then someone picked it up as normal (no roll happened).
Unfortunately, I was in a party with 3+ players from the same guild and figured that, after having kicked an earlier player just as I entered, that they had somehow managed to rig the rolls since everyone but me was able to need on a boss item. I even checked the loot type by pressing O and looking under "My Party" type - it was the usual Need or Greed.
I haven't tried, so I can't guarantee it working, but there might be a possible work around. In the past when a loot roll disappeared on me, due to a cutscene, hitting ALT would bring it back to the front.
I've noticed that sometimes several members of the party can actually make roll (like two or three), but not the whole party. Sometimes loot appears for roll (like a blink) but disappears before it is possible to press any key.
Comments
Unfortunately, I was in a party with 3+ players from the same guild and figured that, after having kicked an earlier player just as I entered, that they had somehow managed to rig the rolls since everyone but me was able to need on a boss item. I even checked the loot type by pressing O and looking under "My Party" type - it was the usual Need or Greed.
I promptly left and the item was a shard...
Might be worth a try.