My vote is for 3.19.5761 as well; that was a rock solid version. The 4.X series introduced a newer database driver though, which I appreciated. I have a large ebook collection and thus a large database file (1GB+) and I'd regularly get database corruption under 3.19 (easily fixable by compacting/rebuilding the database either through Calibre's Kobo Utilities plugin or an external SQL program), but that no longer occurred with the 4.X series. But as was mentioned, the earlier 4.X releases had various minor problems up to around 4.4+ or so, if memory serves.
Last edited by rtiangha; 04-09-2019 at 03:02 AM.
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