Follow-up Comment #2, bug #480 (project tex4ht):
I've found that we need to reset catcodes before loading of Ifthen, we get
some issues otherwise, like in this sample:
\documentclass{article}
\usepackage{biblatex-chicago}
\usepackage[english]{babel}
\begin{document}
hello
\end{document}
It produces an error about unknown command \string:, which is caused by wrong
catcode of the ":" character.
The fix for this issue is in the sources now.
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