Last weekend I ran an enduro event, my first one, but as luck would have it I managed to destroy the rear derailluer before I'd even started by getting the whole derailluer stuck in the spokes. The result was massive mis-shifting and unusable top gears, which got worse and worse throughout the week as the derailluer got more use.
I suspected at the time that I had not put the rear wheel back on correctly - meaning the whole rear wheel wasn't straight. It seems, after replacing the derailluer hanger this morning, the evidence backs that up.
The observant of you will notice a second set of score marks where the skewer has been tightened - you can imagine the angle that would have had the whole rear wheel on. Fortunately I have a new XT on its way - I'm hoping this LX can hold out a week, but who knows.
In addition, it isn't shown in the photo, but the hanger is bent one or two degrees. The result is the hanger being almost a centimeter inwards of where it should sit.
The moral of this story - check things carefully before riding if you've done any work whatsoever
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Thread: How to destroy a derailluer