Did Kovid add the additional RAM requirements on his Download page for v4.0 and higher? Seems he should do this if the QTWebEngine is such a memory hog. That could be why so many people are having problems with 4.0 and later.
And this still doesn't answer the question of why the File Preview doesn't check to see if there is a .css file in the epub first before displaying the text using the default HTML styles.
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