@bauerhjb - are you using 32bit or 64bit calibre ?
Whatever it is you could try the other one - you can have both installed and they will use the same configuration data and libraries.
Doing that seems to have sidestepped a number of weird calibre problems - particularly using 32bit rather than 64bit. The 64bit version only offers an advantage when converting very large books - because it can use more memory than the 32bit version - otherwise there's no difference.
BR
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