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asqueue - I cant recall the details as I never had the problem, and I've also been known to misremember things. Also I forgot this board can't search on sub-strings, and yes I did mean MobileRead Forums > E-Book Software > Calibre > Conversion.
The 'under-the-covers' conversion that happens when you view anything other than an EPUB probably uses 'suboptimal best guess' settings - which would not be those you used when you did a regular conversion. If you've been able to do a regular conversion, then I suspect you don't have the 'dictionaries can be problematic' situation.
If you want to report it as a 'bug' then report the 'bug' here -->>
https://bugs.launchpad.net/calibre. If the dictionary is under copyright and you attach it then mark the post 'private'.
BR