It is not a storage card problem. I've experienced lockups with books on the storage card and books in main memory. The bookmark function stops allowing me to assign bookmarks and I can't use the bookmarks I've assigned. I usually have to fiiddle around with the Cybook (turning it on and off, pushing the reset button on the back, plugging it up to my computer) before I can at least go into the Bookmarks option and delete all my bookmarks. After that I can start assigning bookmarks again until it happens again.
This makes it quite tedious when I am reading a lengthy book and wind up losing my place in it. Then I have to start plugging in page numbers until I get close to where I was in the book and then I can start pressing the navigation button over and over until I get to my place in the book. The Cybook is great, but navigation is really awful.
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