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I suspect the viewer has had a Font set to something that does not support your books character set.
With the viewer CLOSED (off)
In the configuration folder:
Rename viewer-webengine.json to viewer-webengine.json.bak
When you next start the viewer, it will be recreated (with default settings).
If this works, make your other setting changes as desired and delete the previous BAK file.
If it does not help and you had customizations you wanted to keep, delete the NEW version, then rename the .BAK (by removing the .BAK part) file to the original
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