I have a couple of suggestions for updating old epub2 files that were most likely generated by converting MS Word .doc/.html files with older Calibre versions. (Calibre converts .docx files just fine.)
These files often contain the following code:
Code:
<br clear="all" class="calibre5" id="calibre_pb_0"/>
<body lang="EN-US" link="blue" vlink="purple" class="calibre">
The fix is to simply remove the clear, link and vlink attributes.
Here's an
MR epub2 book that contains these attributes.