Hey Margolotte,
I have had the same problem, but as a player! I normally GM everything, being the owner of all the rulesets and the one most likely to organise a game. We usually play one-on-one, with occasional group efforts that last a few weekends or so.
So when I get to play a PC, I often (subconciously) GM the situation, and more recently in a protagonist / narrativist headset. This can undermine or support the (fledgling in most cases) GM, but had the nice side effect of highlighting an obvious, but often overlooked social construct - we are all players at the table.
Bare with me, I know we all know this, but in regards to painting yourself into a corner, the answer is easily grasped when the troupe recognises their strength: We are here to support each other & tell cool stories.
So hey, we (or one of us) have gone down a mechanical or fictional bad road. We stop, call time out and have a group discussion. Is it Salvagable or worth playing through to the end? If not, with overwhelming majority, elucidate with group discussion why?
Name the disruptive mechanical choices or poor implementation of the rulset. What would have been better options? Talk about the problems, not the players (this is most important).Then we usually rewind to the most obvious scene or conflict to 'start over'. Think of it as a possible future, closely avoided.
It doesn't have the awkwardness you at first might imagine, and in AW has the distinct advantage of providing a possible 'dark future' that we have already played out. The maelstrom has presented one of the characters with a vision of madness. As MC, I get one of the Players to open their mind, and depending on the result - how much of the fuckup they get to see as prediction of what might happen. If they miss, well, they think of the whole vision as true (it actually happened!) until convinced otherwise.
This allows for great positive narrative re-inforcement of poor mechanical implementation, and has the bonus effect of the allowing the troupe to identify sub-optimal play and provide resolution as a win-win situation.
Works for me, and my gang. Hope it helps. ;)