Quote:
Originally Posted by kovidgoyal
Try disabling the internal viewer via Preferences->Behavior and see if it happens happens with some other viewer. That will tell us if the problem is in the viewer or elsewhere.
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I did this. I had to change the Windows file assoications as I hd them set to use the Viewer as well for ePub. I actually set it instead to open in TextPad (which is not really an ebook viewer but could load the file). The anomalous file was still created so it looks like it is the main Calibre program creating it and not the viewer.