Task dissapears from inbox

Hi,

I am using MWS 7 SP2.

That can happen because of quite a few reasons

  1. The time to live of the task has expired and it moved to a dead letter queue.
  2. The task has been accepted by someone else in the queue.
  3. Try looking into your personal queue, sometimes the tasks can get auto assigned and move to your personal queue from the group queue.