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Fair enough. I've not seen that but I've not crashed mine hard enough yet. (I mean, I have but I've crashed it so hard there's no recovery mode gonna save it :D)
Mine did similar to sweedee's because I'd installed in a rush and it slipped its position on the hanger lip and so changed through the whole block once and then stopped moving. Once I removed it and reinstalled it (getting the B screw etc right this time) it was fine.
The thing is changing some gears so it can't be in crash mode.