We (Sigil) had an issue on Windows with Qt5 trying to load incompatible versions of openssl dlls that other programs had put on the system PATH. It kept Sigil from starting. But we weren't including our own openssl dlls in the same directory as the Qt5 dlls, either. So the same thing shouldn't plague calibre. But I thought I'd mention it anyway.
Perhaps some profiling with Dependency Walker would reveal something?
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