Hi there! I apologize for the inconvenience. Whenever this happens please follow these steps:
• Clear Cache: http://bit.ly/15PEOUU
• Unplug system / router for 10 mins
• Play 1-3 Zombie matches without force quitting the match
• Check Zombie Crates for rewards
You shall then receive your reward. Thank you. ^TV
Try this. Start a privat solo zombie game, die, and after you should get your latest bounty. This worked on my end.