I had a similar crash on my brand new Glo when trying to change the margins on a sideloaded ePub, and when changing font size. It doesn't crash every time, but it seemed to crash more often (perhaps even every time) when I tried changing the margins while the light is on.
It's probably a firmware problem, which I hope they'll address with their next firmware release. Come to think about it, my Touch also crashed yesterday when changing font size, which never happened before. Something broken there in 2.1.5.
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