just another data point:
It happened for me with only 2 files open and I don't use Calibre to open-with. I double-click on an existing epub file to open.
I'm not sure what you consider long/complex. I'd say on average 25-35 html files, maybe 1-2 links, 1-3 css files, 1-10 image files...
Oh, just thought of somethin'
The ePubs I was opening were in the same book series. I was checking how the previous book was formatted. They contained the exact same 5 image files - plus a different cover image. I have no idea if that has any bearing...
edit: Both books also had those 5 images set on individual html files with an svg wrapper.
Last edited by Turtle91; 09-22-2017 at 12:08 PM.
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