Well it's back, and I can't determine a pattern. I wonder if it is a Kubuntu/KDE issue with the widget that displays the detached book viewer. That sure is a handy feature, but when it keeps putting out the error, always at line 2 column 1, and doesn't display anything it's not much help. It will display the error for something as simple as doing a right click spell check and replacing a mis-spelled word. It will correct itself and show the actual book, at what appears to be, a random whim. Closing and re-starting Sigil usually corrects it for a few minutes.
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