@Becky...I ran Epubcheck on your Quo Vadis test epub and had many errors caused by bad ids in the <body> tag and elsewhere. So I ran the IDErrorCheck plugin on your file first which successfully cleared all the bad ids. Then I ran the RemoveUnusedBookmarks plugin and that removed 241 unused ids. Finally, I ran Epubcheck to see if all errors were gone and it passed without error.
That test file was a great test for both plugins. Thanks again.
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