When I hit the button to finish the random assignment priority assignment I see a dark gray box appear momentarily and the box quickly disappears and I am given no reward for the assignment. I have the option under preferences set to show loot boxes. I received the loot box from the first assignment I did only. It was some of the better loot that I received while playing the game so I did more of the priority assignments but received no lootboxes and usually saw no dark gray box appear for any amount of time but sometimes I would see it appear for a second or less when finishing the assignment. I thought maybe I wasn't meeting some unspecified parameters of the mission but I'm pretty confident it is a bug which causes the loot box to not show up. I made a video clip of it and will try to upload it to youtube so you can take a look if you think it will help aid you in fixing this problem. I like your game and I hope you are able to figure out what is causing this to happen.

Thanks

Bryan