The new version of Apple's Pages exports ePub files with this in the header:
Code:
<script src="../Misc/book.js"></script>
This seems to cause all of the body text to have special characters converted to entities when loaded. Example:
Code:
<body dir="ltr" onload="Body_onLoad()"><div class="body" style="white-space:pre-wrap; line-break:strict;"><h1 class="p21" style="">
When these <script> tags are removed from each xhtml file, the ePub file loads into Sigil properly.