I'm running calibre 0.9.26 (newest version). When I open one of my mobi books from amazon in the e-book viewer, it shows the cover of the book almost immediately. But when I click on the arrow for the next page, it says it's "Loading flow" and the window goes gray (I'm running Ubuntu, and gray windows mean that something isn't responding). After about 40-45 seconds, the title page shows up in the viewer, and from there I can browse inside my book at normal speed.
It's a recent install of Calibre, with just about 300 books in the library. I have installed kindleunpack, but that's the only modification I remember having done. I don't think I have plugins to remove DRM in Calibre as I use the standalone tools to do that. DRM from the book was removed before the book was imported to calibre. During import, no errors or warnings were displayed.
The command
doesn't report any crashes or errors. But it's a large book. Kindleunpack gives me a 2MB html file that opens without problems in firefox, and a ops file and ncx file that I cannot find any errors in. When I use calibre to send the book to my kindle, and opens it there, it opens fine and I can immediately begin reading it.
Is there anything in ebook viewer's code that can hang for 40 seconds? It's a huge book (Towers of Midnight, number 13 in the series Wheel of Time), but not that huge. The rest of the books in this series loads in about 10 seconds. There could of course be errors in the DRM'ed version I downloaded directly from Amazon, and/or there could have happened something to the file when I removed the DRM. But my kindle opens the same file fine, so it doesn't sound like there is a problem with the file itself.
Have any of you experienced something similar?