I interpreted the (I)gnore button in the Search and Replace pop up dialogue as meaning - 'if the search term is found in this context then ignore the search term in that context'.
So a search for 'spelled' to be replaced by 'spelt' would find 'dispelled', if '(I)gnore' was selected then all occurrences of 'dispelled' would be left as is.
But in fact what happens is that all occurrences of 'dispelled' are changed to 'dispelt' - aagh.
If the action I see is what's intended, then I suggest the button be labelled "Change All" (in the English version), if the action should be as I interpreted it then there's a 'bug'.
I think there's a good case for two buttons - Change All and Ignore All (according to my definition thereof

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On a related note, the checkbox labelled - 'Automatic process S/R rules with auto flag set' would be easier to understand if it were labelled 'Automatically process S/R rules with the Confirm checkbox unchecked'. I searched high and low for a flag (checkbox) labelled '...auto...'
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After swapping a number of PM's with Toxaris, I have decided to forego use of the Import EPUB function. The way I want to use it... serially, is probably beyond its intended use, and my other Add-ins could 'interfering' with EPUB Tools (possibly a COM v VSTO issue)
Toxaris, feel free to contact me direct to do any alpha/beta stress testing
BR