I have the same problem after installing beta 3.
You can't even preview the standard app template...
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I have the same problem for my app. Are your problem solved?
Exactly, I have a lot of questions that would be answered if we could see the source code for Book Reading.
Example. Where should I create the CurrentReading observable object?
Update: I have found my problem. I had the top list as grouped and the second level as default. When I changed the top list to default it works.I have the exact same problem and I can't get my head around why. I have also tried to remove the second view (for splitview). But I get the same problem after rotating the device to landscape and then back again.