I'm working on all the eBooks with the Calibre Editor I've purchased and those that are free, before I copy them to my Reader. With none of the different versions (2.99.1 to 2.99.10) I had any problems.
However, the eBook must be saved before you can view it with the Calibre Viewer (not the real-time preview in the editor). Than the eBook is already saved.
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