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@jackie_w: That is because webengine is not useable in the main calibre program only the editor/viewer. This is because it is very resource intensive and Qt requires that it be imported before starting the appication. Since the main GUI does not use it, I do not import it, which also means it cant be imported in any plugins. What does scrambleebook use it for? There are two possible workarounds, it is is not something that requires sophisticated HTML support then QTextBrowser can be used, otherwise you have to run it in a separate process.
@eschwartz: Given that all plugins will need to be ported to python3, it will be a long time before calibre is ready for py3. But yes, my next painful job after v4 is done is to work on getting betas ready with py3 so the plugin developers can start work on porting their plugins.
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