Lately, we have noticed several Facebook and MeinVZ posts on the topic of disappearing tasks, meaning a Clickworker does not receive a successive task assignment even though (s)he hasn’t worked through many herself. This is not the first time we have seen the question, and actually, we have known the root causes for a while:
Editors check the work of other Clickworkers. As an editor, you may correct small errors, give the author another chance to redo work, or reject bad work. The work of editors has some stumbling stones.