From what I undestand, the issue was created by Amazon. (Someone please correct me if I'm wrong.)
I don't know about calibre being the fix, except from what I've read that the new version does, indeed, 'fix' this issue. (Remember, I can't enjoy the benefits of the newest calibre, as previously mentioned.)
My computer is 10 years old, and I should buy the newest model when computer stores open back up again [in the country I'm in].
In the meantime, it would sure be great to have a plug-in written especially for the 3.x.x. version of calibre - if, as reported, calibre can fix this issue of the disappearing covers from side-loaded ebooks.
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