[Ghitulescu]

I noticed that a lot (I probably could almost safely say 100%) of ePubs from archive, in the last say 2-3 years, appear to block the ADE and give various errors in Calibre 4.xx I use. They do not load in ADE (right now I closed one instance of ADE running for 3 hours to load such an ePub and being all the way irresponsive).

It doesn't matter whether the book is old or new (printing year), just that the books I have used years before work ok (still have some quirks, but rather inoffensive, solved by reconverting to epub in calibre) and those recent don't.

I spend some hours reading the various complains about archive, it appeared that many are discontent with the PDFs but the bad quality (incompatibility) of ePubs have not been raised that often (there is one single thread about it, here).

The ADE is 4.5.11.something and has no problems whatsoever displaying good ePubs I have (mine, made with sigil and calibre, or from other trusted sources).
I did not trust to load them on my hardware eReaders for the fear of getting them bricked.

Has anyone encountered this issue?