There is one recent issue and one long standing issue.
The recent one is people jumping in out of turn, and others saying who is next while not paying attention to who really was next. See this in the original post. It only took a gentle reminder to sort this out.
the correct fastest fingers first wins, and gets to post the next question
The other is the how many days thing. This is both for people not guessing the current plane and for posting the next plane. This is also from the original post.
If 24hrs passed with no answer attempted (or subsequently thereof if any), kill will be awarded to poster.
This rule of 24 hours has never worked. It assumes everyone playing the game checks it more than once a day. From the years I've been playing this game it typically takes 2-3 days before people even see a new post. On harder ones it can take a week before anyone attempts a guess. But somewhere in the range of 2-3 weeks starts getting to be too long. We had a recent partial image which went a few weeks before anyone attempted guesses, and when those failed several more weeks before the game moved forward.
My own personal rule of thumb is at 3 weeks of nothing, if I want the game to move forward I step in and post a new plane.