Daily Quest Not Working

[Screwy]

So today my Daily Quest was to eat 13 viruses.  The count was on the bottom of the screen so I know I didn't miss count.  When I got to 13 the count disappeared and the game played out like normal, but on exit I wasn't rewarded with the prize.  I checked the Daily Quest box to see if it'd registered... and it was still showing that I had to eat 13 viruses.  I'm not the best player in the world so I was pretty happy to complete the quest, but now I'm just feeling ripped off.  Does this happen often?  Do others have the same problem?  It's happened to me before but the quest has usually been easy enough to complete again but this was harder so I was kind of hoping the prize would be worth it.  To get nothing sucks big time.