In the attached file unicode.zip (60.6 KB), the html has some unicode characters. The conversion of the html to pdf changes the unicode characters to greyscale and some of them are not supported, just the same as if the html is opened in Internet Explorer or MS Word (see unicodeIE.png). Whereas in firefox, the unicode characters are fine (see unicodeFirefox.png).
Is this a font issue?
We have tested the scenario and managed to reproduce the same issue at our side. For the sake of correction, we have logged this problem in our issue tracking system as WORDSNET-22800. You will be notified via this forum thread once this issue is resolved.
We apologize for your inconvenience.