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Description of problem: Install to HD from XFCE live desktop. Clicked past the storage screen that had "use LVM" checkbox. Clicked back at confirm screen. Deselected "use LVM". Clicked next. Got message about "are you sure, you don't have a configured boot loader/device". Went back again and select LVM, and everything worked. FWIW, on the normal desktop I deselected LVM immediately and it showed no message.
This should be fixed in F18, where we don't have these ridiculous next/back button related errors.