Quote:
Originally Posted by alansplace
None of the above!

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Does the editor also show blank pages? If so, one possibility that comes to mind are the documented issues with Windows 7 (for the most part) and video drivers after updating to calibre 4.x.x. A calibre bug report can be found at
E-book viewer is completely blank.
It may help if you are able to update your video driver.
Edit: Just wondering what this has to do with conversion?