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Define STOPPED better.
On what OS.
Is there an icon (still) in the tool tray? What does the header of the window show, eg (not Responding)
Video drivers are a common cause of a Frozen video.
Anti-malware blocking the 'worker' (or the request for permission is off screen)
Have you tried using the Editor with a different book (the book may have a weird corruption or DRM)
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