If you're sending .kepubs to the device through jgougen's extended driver, make sure you have your reference.kepub.epub file in the right place. I had mine inside a KoboTouchExtended folder in Calibre's plugin folder, and it seems like it was changed to the root plugin director at some point. When I moved the file out of the folder into the root plugin folder and re-sent my books to the device any freezing on load problems vanished.
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