The ini file got corrupted, so important information was not where it was expected. Very weird inexplicable things happen, like a dictionary that can not be corrected, etc, when this file is corrupted. The only shortcoming of deleting it is that some of your settings will need to be re-entered. It is rebuilt by Sigil when it is entirely missing.
The thread stays on this forum so when someone has a similar problem they can take a look at it and fix it without having to post a new question and wait for an answer.
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